Definition of deep in English:


Line breaks: deep
Pronunciation: /diːp


  • 1Extending far down from the top or surface: a deep gorge the lake was deep and cold
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    • The mountain scenery was totally awesome with spectacular peaks, glacial rivers and deep mountain gorges.
    • Since it was built over a deep gorge, it was well protected against destructive forces.
    • Rocky gullets of white water open out into deep gorges where salmon lie waiting for water to continue their upstream journey.
    extending far down; cavernous, yawning, gaping, huge, big, great, extensive, profound, unplumbed; bottomless, immeasurable, fathomless, unfathomable
    rare chasmic
  • 1.1Extending or situated far in from the outer edge or surface: a deep alcove deep in the woods
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    • Why is it impossible to pump water from very deep in the ground with a surface pump?
    • The grave generally is located in a riverbed or somewhere deep in the forest.
    • Last September we went to the Italian Grand Prix at Monza, just in the general admission section which was deep in the woods.
    extending far back/in, extending a long way back, extensive
  • 1.2 [predic.] (After a measurement and in questions) extending a specified distance from the top, surface, or outer edge: the well was 200 feet deep
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    • Adding more debt to a debt ridden business is like adding a sledge to the back of a man trudging through six foot deep snow.
    • It was a problem getting this water to the surface as the average well was 100 feet deep.
    • What are you going to do when the ground below you suddenly disappears and a 100 meter deep hole opens up?
    in depth, downwards, inwards, from top to bottom, from the surface, in vertical extent
  • 1.3 [in combination] As far up or down as a specified point: they stood waist-deep in the water
  • 1.4 [predic.] In a specified number of ranks one behind another: [in combination]: they were standing three-deep at the bar
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    • Sadly, without ranks of police four deep, the football fans will rip out each other's throats.
    • It was three-deep at the bar, with icy platters of oysters and glasses of sparkling wine littering the marble top.
    • Organized ranks, five deep and five wide, marched right below him.
  • 1.5Taking in or giving out a lot of air: she took a deep breath
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    • She took a deep breath and swallowed the sobs that were rising in her throat.
    • Once she was settled in with an arm slung over his chest, she sighed a deep breath of relief.
    • Michael sighed, leaning his head back as he took a deep breath to calm himself.
  • 1.6 Cricket (Of a fielding position) relatively distant from the batsman; near the boundary: deep midwicket
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    • His shot lobs high into the air before landing short of Harmison at deep midwicket.
    • Dravid was out attempting to hit a six, the ball landing with the deep midwicket fielder.
    • Blackwell deposited Gary Keedy into the pavilion for a massive six, but was then well caught at deep square-leg off Kyle Hogg.
  • 1.7(In ball games) to or from a position far down or across the field: a deep cross from Neill
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    • He blasts a volley from a deep cross into the side-netting.
    • His deep cross nearly becomes a freak goal; it spins back towards the net and rolls right along the top of the crossbar and stays in play.
    • Adam Johnson's deep cross from the right found Martin Packer on the opposite flank.
  • 4(Of colour) dark and intense: a deep pink
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    • Although the main stem is still thin and whippy, it is an attractive, shiny, deep purple in colour.
    • The colours are deep and rich and help set an operatic mood and tone for almost every scene.
    • The sky had become a dark shade of indigo, tinged with the remnants of deep magenta.
    dark; intense, vivid, rich, strong, brilliant, glowing, vibrant, bold, warm, flamboyant, eye-catching


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  • 1 (the deep) • literary The sea: denizens of the deep
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    • The oarsmen pushed their oars above the water while a brawny man dropped an anchor into the deep.
    • And that's before we even get to the more bizarre denizens of the deep.
    • A bit later they had proof of his ignorance when he told them to cast their nets in the deep during broad daylight.
  • 1.1 (usually deeps) A deep part of the sea: the dark and menacing deeps figurative the deeps of her imagination
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    • Everywhere from the shallows of time to the deeps the ocean is one and the same water.
    • Scanning the area with invisible eyes, the figure finally dismissed its feelings as a mistaken judgement, before swimming on into the murky deeps off the ocean's continental shelf.
    • Tube worms and bacteria coexist in the inky darkness of ocean deeps.
  • 2 (the deep) Cricket The part of the field distant from the batsman.
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    • He was also noted for his magnificent fielding in the deep.
    • If a better catch has been taken in the deep in any form of cricket, I'm not sure that I've seen it.
    • He made 70 runs off just 68 balls before being caught in the deep.


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  • 1Far down or in; deeply: he travelled deep into the forest
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    • The narrator gets off a train in a deserted countryside and walks deep into the forest, where he makes camp and goes to sleep.
    • The peroxide, he says, wouldn't penetrate very deep beneath the surface.
    • Some short trails lead to viewpoints; longer and more difficult trails penetrate deep into the forest and wilderness.
    far down, far in, deep down, way down, to a great depthfar, a long way, a great distance, a good way
  • 1.1(In sport) distant from the batsman or forward line of one’s team: he swung the ball in deep
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    • By drifting from side to side and dropping deep he found space from which to torment the other team.
    • He will have to throw deep a few times early to keep the safeties out of the box.
    • In this game Royal made the mistake of either kicking too deep or not chipping.


the deep end

The end of a swimming pool where the water is deepest.
More example sentences
  • Others dived nimbly off the diving board into blue water of the deep end of the huge swimming pool.
  • At the sound of approaching footsteps, frogs hopped into the filthy, dark water at the deep end of the swimming pool.
  • Hang on, that's about the depth of the deep end of the local swimming baths.

dig deep

informal Use one’s physical, mental, or financial resources: dig deep—I know you can do better the generous trio decided to dig deep into their own pockets
More example sentences
  • They have the moves, they have the power, but do they have that mental toughness to dig deep for 80 minutes?
  • I guess I'll have to dig deep and tap those resources of grit and resilience within me.
  • Generous Swindonians dug deep in their pockets and raised hundreds of pounds for the National Osteoporosis Society.

go off the deep end

Give way immediately to an emotional outburst, especially of anger: now don’t go off the deep end—I’ve thought of an idea
More example sentences
  • I just went off the deep end and I said, ‘Hey, this is going too far’.’
  • Some Bulgarian leaders, and its media, went off the deep end after a Bulgarian gymnastics hopeful was judged worthy of silver, but not gold.
  • If anyone out there thinks the Globe & Mail is biased, the Calgary Herald, Calgary Sun and National Post have absolutely gone off the deep end since the election.
chiefly US Go mad; behave extremely strangely: they looked at me as if I had gone off the deep end
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  • My mother has always been crazy but she finally went off the deep end and severed ties with me and her mother who I stay with.
  • I don't know if she's just goofing around or if she's totally gone off the deep end.
  • And pretty soon the fridge was empty and we're sitting there in the kitchen, laughing so hard about heart disease and strokes that I thought we'd both gone off the deep end.

go (or run) deep

(Of emotions, beliefs, etc.) be strongly and wholeheartedly felt or held: his passion runs deep
More example sentences
  • His allegiance to the cause runs deep.
  • Loyalty to a sibling ran deeper than loyalty to a spouse.
  • I know that Dad's mental scars run deeper.

in deep

Inextricably involved in or committed to a situation: he knew that he was in deep when his things began to proliferate in her apartment
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  • The shooting began to sink in and he realised he was in deep, way over his head.
  • You're in deep in the system, in its fouled blood, in its creaking bones, in its edgy nerves.
  • Four likely London lads are in deep to a mobster and try to find ways to come up with the dosh.

in deep water (or waters)

informal In trouble or difficulty: he landed in deep water when he began the affair
More example sentences
  • Many Christians only think of God when they are in deep water, they get in trouble and they scream for God, they get out of trouble, and they run back to their sin and rebellion.
  • I've been in deep water and he hasn't been in deep water and we'll see how he handles that.
  • With his manipulative talents, he landed his opponent in deep waters.

jump (or be thrown) in at the deep end

informal Face a difficult problem or undertaking with little or no preparation or prior experience: they’re thrown in at the deep end and have to develop skills quickly
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  • We were thrown in at the deep end when we won a major global project with a London bank and we needed to get moving quickly.
  • A lot of players were thrown in at the deep end, me being one of them.
  • I was thrown in at the deep end and they put me on the Finance Committee.



More example sentences
  • There's a deepness in this song that I've only glimpsed in other works.
  • There weren't any words to describe the deepness of his feelings.
  • Her round figure and the deepness of her voice reminded him of the images of the kinds of mothers who were kind and understanding from storybooks.


Old English dēop (adjective), dīope, dēope (adverb), of Germanic origin; related to Dutch diep and German tief, also to dip.

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