There are 2 definitions of lock in English:

lock1

Line breaks: lock
Pronunciation: /lɒk
 
/

noun

1A mechanism for keeping a door, window, lid, or container fastened, typically operated by a key: the key turned firmly in the lock
More example sentences
  • Use steel doors with deadbolt locks and bar windows where appropriate.
  • Dead bolts on the doors, and key locks for the windows are the safest.
  • Funding can be provided for window locks, door locks, door chains, security lighting, socially monitored alarm systems, smoke alarms.
Synonyms
1.1A device used to prevent the operation or movement of a vehicle or other machine: a steering lock a bicycle lock
More example sentences
  • Andrew said the thieves had cut through his bike lock before stealing the machine, which had been parked off Fossgate.
  • A protective husband accused of beating a man to death with a steering lock after his wife's car was damaged acted in self-defence, a court heard yesterday.
  • You've tried three times now, and all you've managed to do is break the steering lock.
1.2A facility on a computer or mobile phone that requires a user to verify their identity with a passcode or other form of authentication in order to access the full functionality of the device: there’s a security lock on the phone and he doesn’t know the code
More example sentences
  • The tablet even features a display lock, which locks the tablet's display and buttons, allowing young children to enjoy videos or interactive books without interruption.
  • With the built-in smart fingerprint sensor, the tablet's security lock can be released by simply placing the finger of a pre-registered user on the sensor.
  • By pressing the lock button to wake the phone, you will be prompted with the unlock screen.
1.3(In wrestling and martial arts) a hold that prevents an opponent from moving a limb.
More example sentences
  • I worked out ways to defeat the headlocks, body locks and rear holds from wrestling.
  • The Kimura lock is the favourite armlock of Marcus Soares: once he locks it on, there is no escape.
  • This is the reason leg locks are barred in judo contests.
1.4 [in singular] archaic A number of interlocked or jammed items: I have seen all Albermarle Street closed by a lock of carriages
2A short section of a canal or river with gates and sluices at each end which can be opened or closed to change the water level, used for raising and lowering boats: there was a lock every quarter of a mile
More example sentences
  • It was nicknamed the Everest of canals because its 91 locks lifted boats 600 ft.
  • During low stages on the Mississippi River, flood control locks are opened seasonally to drain the interior floodplain waters.
  • But a surprising number of deaths are also caused because manatees have no fear of Florida's underwater canal gates and locks.
3 [mass noun] British The turning of the front wheels of a vehicle to change its direction of motion.
More example sentences
  • Out of the hairpins the H1 is perfectly happy at 45 degrees, with half a turn of opposite lock and the rear wheels spinning up a treat.
  • The steering lock is not brilliant, but it never is on a race car, though of course at racing speeds you do not need much lock to change direction!
  • Turning lock is good though and despite no power steering, it's relatively easy to manoeuvre for a big car.
3.1 (also full lock) The maximum extent that the front wheels of a vehicle can be turned.
More example sentences
  • This culminates in a hairpin taken in first gear with the steering wheel virtually at full lock.
  • Thus, at a crawl, you can achieve full lock in three-quarters of a turn of the steering wheel - which means that you can reverse into a parking space without winding your arms around each other and gradually dislocating your shoulders.
  • Even on full lock and teasing it with your right foot, the car just glides around with no kickback through the power assisted steering.
4 (also lock forward) Rugby A player in the second row of a scrum.
More example sentences
  • It is her plan to represent Scotland as a lock forward at Rugby that causes both her mother and me the most concern.
  • Just like last weekend's international match, this game was dominated by a red card to a lock forward and, just like last Sunday, it came after just 20 minutes.
  • And it must have been pretty hard accepting having a lock forward move back into his eighthman spot for the two biggest matches in South Africa's proud rugby history.
5 (a lock) North American informal A person or thing that is certain to succeed; a certainty: all of this makes him a lock to make the Hall of Fame
More example sentences
  • Avion Black filled in nicely when Lewis was injured but is not a lock to succeed him.
6 historical A mechanism for exploding the charge of a gun.

verb

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1 [with object] Fasten or secure (something) with a lock: she closed and locked her desk (as adjective locked) behind locked doors
More example sentences
  • She closed the door behind her and locked it with the chain lock just above her head.
  • He then left the room, shutting the door behind him, and locking it securely.
  • I sprinted up the stairs and shut my bedroom door behind me, locking it securely.
Synonyms
bolt, fasten, bar, secure, make secure, make fast, seal; padlock, latch, chain
1.1 [no object] (Of a door, window, etc.) become or be able to be secured with a lock: the door will automatically lock behind you
More example sentences
  • The outer doors lock automatically at 8:00 p.m., three hours after the retail section has shut down.
  • Hurriedly, they moved inside and toward another elevator, the door locking automatically behind them.
  • What's more, when he enters, the doors lock automatically and he's trapped inside.
1.2 [with object and adverbial] Enclose or shut in by locking or fastening a door, lid, etc. the prisoners are locked in overnight Phil locked away the takings
More example sentences
  • The death of a Bradford teenager engulfed in flames after igniting a highly flammable liquid could have been avoided if the chemicals had been properly locked up, an inquest heard.
  • So he's locked up for 23 hours a day in a steel cage.
  • ‘It has been locked up in a safe; it has been rolled up for decades and it's an important work,’ he said.
2Restrict access to the full functionality or data of (a computer, mobile phone, file, etc.), especially by requiring a user to verify their identity with a passcode or other form of authentication: my computer is locked and I’ve forgotten my login info I don’t want people to read my emails—that’s why I lock my phone
More example sentences
  • The app works whether your phone is locked or not, and it can be told to repeat alarms so you don't have to reset it every day.
  • To re-lock the phone, you can use the same thumb to lock the iOS device, by swiping down from the top of the screen with camera open!
  • If your phone is locked while you're driving or sitting next to you while you work, you don't have to unlock it to see what's playing.
2.1 (be locked) (Of a mobile phone) operate only on the network of a particular carrier: the phone is locked to T-mobile (as adjective locked) locked phones can only be sold to people who have the same carrier
More example sentences
  • Your phone won't be locked to an individual carrier, so you can easily switch providers if performance degrades or you move to a new house where your original carrier doesn't work.
  • A locked Telstra phone won't work with Vodafone, and vice versa, in other words.
  • For those of us who have cell phones that are not locked into a carrier, you might find it cheaper to buy a prepaid SIM chip once you arrive at your destination.
3Make or become rigidly fixed or immovable: [with object]: he locked his hands behind her neck [no object]: their gaze locked for several long moments
More example sentences
  • He stepped forward rigidly, his eyes locking on hers.
  • Shooting doesn't require the knees to be visibly bent; the point is they shouldn't be rigidly locked.
  • His armed were pinned down at his side, his legs locked rigidly parallel of each other.
Synonyms
join, interlock, mesh, engage, link, unite, connect, combine, yoke, mate; couplebecome stuck, stick, jam, become/make immovable, become/make rigid
4 [no object, with adverbial of direction] Go through a lock on a canal: we locked through at Moore Haven

Origin

Old English loc, of Germanic origin; related to German Loch 'hole'.

Phrases

have a lock on

North American informal Have total control over: he has a lock on much of the political establishment in Georgia
More example sentences
  • If they couldn't win in 2004, they will never win, because the Republicans now have a lock on absolutely every political and judicial instrument in the country.
  • Say you work or go to school in a state where the Republicans have a lock on all the important offices.
  • It is easy to believe that the devil has a lock on what is popular.

lock horns

Engage in conflict: drug companies are locking horns in a legal battle over patents
More example sentences
  • Would such opposites attract, learn from each other, and astonish us, or would these two conflicting musical spirits lock horns and fight it out?
  • Fearful to confront, because of our own fears, perchance we find ourselves looking into a mirror and are terrified to lock horns with our own conflicting thoughts.
  • Across Ohio, Pennsylvania and Florida, lawyers have already locked horns paving the way for lengthy court fights if the election is close.
Synonyms
quarrel, disagree, have a dispute, wrangle, bicker, be at odds, be at loggerheads, lock antlers, cross swords; fight, do battle, engage in conflict, contend; challenge
informal have a dust-up, have a scrap, have a barney

lock, stock, and barrel

Including everything; completely: the place is owned lock, stock, and barrel by an oil company
[referring to the complete mechanism of a firearm]
More example sentences
  • She returned from a vacation in Greece and found that someone had moved in, lock, stock, and barrel - complete with redecorating.
  • It then essentially hands the entire thing, lock, stock, and barrel, to this unelected and unaccountable committee.
  • If they were to sell off the operating agency lock, stock, and barrel, and lease the use of the tunnels and stations for, say, a 99-year period, there might be hope.

under lock and key

Securely locked up: the rifle was stored under lock and key figurative Julius always kept his personal feelings under lock and key
More example sentences
  • Afterwards it will once again be under lock and key, behind a shatterproof, bulletproof, glass window, away from prying fingers.
  • The farmers are appealing to all dog owners in the area to make sure their dogs are chained or under lock and key especially at night time when most of the damage seems to take place.
  • Is it a question of women being literally held as slave captive in the physical sense, living behind bars, under lock and key, or is it a question of something more subtle?

Phrasal verbs

lock someone down

North American Confine a prisoner to their cell: the men were locked down for the usual curfew bedtime
More example sentences
  • I was locked down in a cell made for two, with five people, no working toilet, no food and no protection.
  • Before I was locked down, 3 troublemakers entered my cell and commenced to verbally assail my ailing celly.
  • Even his incarceration could not stop him working towards his ambition of a Lonsdale Belt: ‘I managed to train every day, even though I was locked down from eight at night until eight in the morning.’

lock someone/thing in (or into)

Involve someone or something in (a difficult or competitive situation): they were locked in a legal battle
More example sentences
  • Historically, war locks nations into an economy where preparation and fighting consumes billions of dollars.
  • On his travels, Sachs started noticing geographic, historic and social circumstances that lock countries into poverty traps.
  • As the government's increase in prescription charges shows, we are not locked into a situation where changes cannot be made.
Oblige a person or company to abide by the terms of a contract for a specific period: you’re locked in to the society’s standard variable rate throughout that time
More example sentences
  • It is not just PFI schools that find themselves locked into long-term contracts.
  • Or because rates were moving so fast, they never locked in the promised rate.
  • The owners are demanding the lengthening of rookie contracts, which lock players into a preset wage scale, from the present three-year agreement to five years.

lock on to

Locate and then track (a target) by radar or similar means: the new laser gun can lock on to a car from almost half a mile
More example sentences
  • It automatically passes on details of the most serious threat to the ship to Seawolf's tracker, which then looks for - and locks on to - the incoming target.
  • Driven reticles confirm the missile seeker is locked on to the same target the gunner is tracking.
  • Faced with too many targets and choices, the missiles failed to lock on to a single radar.

lock someone out

1Keep someone out of a room or building by locking the door: she had locked him out of his own house
More example sentences
  • ‘And you can prevent it by simply turning the key in the door and locking them out,’ he said.
  • She responded by inviting him to her room and locked him out in the corridor.
  • And the point is, I'm staring at the door because I am locked out.
2(Of an employer) subject employees to a lockout: coal miners had been locked out by the mine owners
More example sentences
  • The strikers occupied factories to prevent employers from locking them out, and these sit-ins became festivals, intended both to reclaim workplaces for the workers and to spread the protests.
  • But their employer locked them out last year, and they have been campaigning for their jobs ever since.
  • An employer has to pay his employees wages during a strike and cannot lock them out.

lock someone out of

Exclude someone from: those now locked out of the job market
More example sentences
  • Otherwise, they could be locked out of the US market from December 12.
  • The French and German governments informed the Turkish opposition parties that if they voted to help the Coalition war effort, Turkey would be locked out of Europe for a generation.
  • The submission also says landholders south of the border were under-represented, and the New South Wales Government was locked out of contributing to the draft plan.

lock someone up (or away)

Imprison someone: he thought Smart ought to be locked up
More example sentences
  • If you want to lock someone up in jail, you need to prove beyond reasonable doubt that they did it, so you have to have an adversarial system where you can rigorously test the evidence of a complainant.
  • She spent five years on death row, albeit one specially created for her by the Florida prison authorities, which cleared out an entire wing of an old prison for women, before locking her up in solitary confinement.
  • If I was in charge of the Correctional Services, I would lock you up in solitary confinement and throw away the key, better still, I would bring back the death penalty.
Synonyms
imprison, jail, incarcerate, send to prison, put behind bars, put under lock and key, put in chains, put/throw into irons, clap in irons, hold captive; detain, remand, intern, impound, immure, shut up, shut in, confine, cage, pen, coop up, fence in, pen in, wall in, mew (up)
informal send down, put away, put inside

lock something up (also lock up)

Shut and secure a building by fastening its doors with locks: they locked up the building and walked off you could lock up for me when you leave
More example sentences
  • In October 2000, tenants say two employees of the company forced them all to move out of the building by using intimidation tactics like threats, dogs, locking the building up and shutting off electricity.
  • After shutting the door and locking it up, she turned to look at Hope.
  • We had no way of knowing how bad the fire was until we got into the building because obviously it had been locked up since Friday.
(lock something away) Invest money in something so that it is not easily accessible: vast sums of money locked up in pension funds
More example sentences
  • This high level of tax relief makes pension vehicles far more attractive investments than most, but the drawback is that all money in the fund is locked away until retirement.
  • As members may be locking their money away for several decades, they may be willing to take a bit more risk to get a better return.
  • Perhaps locking the money away in a non-liquid asset such as property is not the best option.

Derivatives

lockable

adjective
More example sentences
  • There are loads of storage compartments, including illuminated, lockable and air-conditioned glovebox, storage compartments in the front and rear doors, as well as storage pockets on the front seat backs.
  • The lockable mahogany cabinet was designed to file the important legal documents and business accounts used in managing the Battie-Wrightson family estates in South Yorkshire and the north-east of England.
  • Cost of ownership and the fun factor aren't the only strengths of his great little machine. There's tons of storage space under the seat and in the glovebox underneath the handlebars, both of which are lockable.

lockless

adjective
More example sentences
  • Despite the lockless connecting door, Mel was quite satisfied with the room assigned.

Definition of lock in:

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Pronunciation: merəˈtriSHəs
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apparently attractive but having in reality no value...

There are 2 definitions of lock in English:

lock2

Line breaks: lock
Pronunciation: /lɒk
 
/

noun

1A piece of a person’s hair that coils or hangs together: she pushed back a lock of hair
More example sentences
  • His eyebrows knit angrily together under a lock of loose black hair.
  • He had thick black hair, a lock of which was hanging over his eye.
  • She twisted a lock of bright hair between her fingers.
Synonyms
tress, tuft, curl; ringlet, kiss-curl, lovelock, forelock, plait; hank; strand, wisp; snippet
1.1 (locks) literary A person’s hair: flowing locks and a long white beard
More example sentences
  • When it comes to length, Danilo suggests those with curly locks keep hair short or very long.
  • He had chopped off his unruly black locks and his hair was now short and neat.
  • Earlier, without any joy, the coach had demanded the player shave off his flowing ginger locks and wild beard combo.
1.2A tuft of wool or cotton.
More example sentences
  • Fringe your dappled fawnskin cloaks with wooly tufts and flowers, and locks of purest white.

Origin

Old English locc, of Germanic origin; related to Dutch lok, German Locke, possibly also to lock1.

Derivatives

locked

adjective
[in combination]: his curly-locked comrades

Definition of lock in: