Definition of rat in English:

rat

Line breaks: rat

noun

1A rodent that resembles a large mouse, typically having a pointed snout and a long tail. Some kinds have become cosmopolitan and are sometimes responsible for transmitting diseases.
  • Family Muridae: many genera, including Rattus (the Old World rats), and several hundred species
More example sentences
  • Most people are familiar with mice, rats, hamsters, and guinea pigs, which are commonly kept as pets.
  • Cane rats should not be confused with domestic rodents such as rats and mice which can be disease-carrying vermin.
  • Up until 1987 this kind of experiment had only done in rodents, rats and mice, and in lower organisms.
2 informal A despicable person, especially a man who has been deceitful or disloyal: her rat of a husband cheated on her
More example sentences
  • He, who's a braggart and a drunk and a rat and a scoundrel, at his death bed, says, I find Christ.
  • How can you make a philandering love cheat, who works his way through a family of sisters, anything but a rogue and a rat?
  • ‘For your information this little rat insulted me’ Debbie huffed sticking her chin up snobbishly.
Synonyms
scoundrel, wretch, rogue
informal beast, pig, swine, bastard, creep, louse, snake, snake in the grass, bum, lowlife, scumbag, heel, skunk, dog, weasel
British informal scrote
North American informal rat fink
Irish informal sleeveen
Australian informal dingo
dated rotter, cad, bounder
vulgar slang shit
2.1An informer: he became the most famous rat in mob history
More example sentences
  • It's different when Right Wingers want to crush free speech and create a police state environment of informers and rats in a house of worship.
  • I go by beeper now because there's too many rats [informants] on the street.
  • Mr. Ken told me that the rat was an informant for the enemy.
Synonyms
informer, betrayer, stool pigeon
informal snitch, finger, squealer, nose
British informal grass, supergrass, nark, snout
Scottish & Northern Irish informal tout
North American informal fink, stoolie
Australian informal fizgig, pimp, shelf
3 [with modifier] North American informal A person who is associated with or frequents a specified place: LA mall rats
More example sentences
  • There's nowhere else I'd rather be right now - on a trip in South Africa with a good crew and having fun, skating everyday, and doing a real skate rat tour.
  • Mali, while seeming sophisticated, wanders in and out of ghetto rat behavior, especially when it comes to her man, Tad Honeywell.
  • At the first, it was decided to axe three popular characters - love rat doctor Matt Ramsden, his teacher wife Charlie, and shopworker Bobbi Lewis.
4US A pad used to give shape and fullness to a woman’s hair.

exclamation

(rats) informal Back to top  
Used to express mild annoyance or irritation.
More example sentences
  • I just came upstairs to check the price of something on eBay (under $10, rats!) and saw the clock.
  • Divisions were actually for sale at Behnke, a nursery local to me and I didn't know it - rats!
Synonyms
damn, damnation, blast, hell, heck, Gordon Bennett; Britishbother
informal drat, sugar, botheration, flip, flipping heck/hell
British informal dash, blooming heck/hell, blinking heck/hell
North American informal doggone it, shucks, shoot, tarnation
Indian informal arré
dated confound it, pish

verb (rats, ratting, ratted)

[no object] Back to top  
1 (usually as noun ratting) Hunt or kill rats: ratting is second nature to a Jack Russell
More example sentences
  • In another era, perhaps he and his mates would simply have gone out poaching or ratting, grumbling about bloody women along the way.
  • The Shar Pei still exhibits these herding and ratting instincts.
  • The Giant Schnauzer's original job was ratting.
2 informal Desert one’s party, side, or cause: many of the clans rallied to his support, others ratted and joined the King’s forces
More example sentences
  • The Stability Pact was to have kept the currency health, but it became inconvenient for France, which ratted, followed by Germany, France, Italy, Holland, and Greece.
  • Shortly afterwards, getting into his car, he was called by name and, when he turned, was shot through the forehead by a fellow extremist who suspected he had ratted.
  • The other men don't shoot the soldier who ratted, however.
3 [with object] US Shape (hair) with a rat.
More example sentences
  • Her ponytail was ratted and her bangs were sticking up all over while her braids were perfectly fine as they always were.
  • She's got long black hair, ratted and dry, and it hangs down over her shoulders like a fern that hasn't been watered in weeks.
  • There was Stacey in her big girl bra, ratted out hair and adult acne.

Origin

Old English ræt, probably of Romance origin; reinforced in Middle English by Old French rat. The verb dates from the early 19th century.

Phrasal verbs

rat on

(also North American rat someone out) informal Inform on (someone): he refused to rat on his buddies
More example sentences
  • Words and titles are about to become very important as people figure out which one of Cheney's goons ratted her out.
  • ‘I don't think you should rat her out, but let her know you saw her cheating and that it could get her in a lot of trouble,’ suggests Lindsay.
  • I hadn't planned on ratting Ryan out anyway, but his response had taken me by surprise.
Synonyms
inform on/against, betray, be disloyal to, be unfaithful to, break one's promise to, break faith with, sell out, stab someone in the back
British informal grass on, shop
North American informal rat out, finger, drop a/the dime on
Australian informal pimp on, pool, put someone's pot on
Break (an agreement or promise): he accused the government of ratting on an earlier pledge
More example sentences
  • If we believe Gordon's account, as relayed through Robert Peston, Blair ratted on a promise to go by November of last year.
  • He ratted on his promise to take me with him - saying that there would be questions in the parliament if he spent too much money.
  • Whatever the cause, France ratted on his agreement, retaking Brest by force.
Synonyms
break, renege on, go back on, back out of, default on, welsh on; break one's word

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Pronunciation: ˈgəzəl
verb
eat or drink (something) greedily