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rat

1 of 2

noun

1
a
: any of numerous rodents (Rattus and related genera) differing from the related mice especially by considerably larger size
b
: any of various similar rodents
2
: a contemptible person: such as
a
: one who betrays or deserts friends or associates
3
: a pad over which a woman's hair is arranged
4
: a person who spends much time in a specified place
a mall rat
ratlike adjective

rat

2 of 2

verb

ratted; ratting

intransitive verb

1
: to betray, desert, or inform on one's associates
usually used with on
2
: to catch or hunt rats
3
: to work as a scab

transitive verb

1
: to give (hair) the effect of greater quantity (as by use of a rat)
2
: to inform on : turn in
usually used with out
ratted out his accomplice

Example Sentences

Noun a dirty old building infested by rats and mice I can't believe that rat turned us in to the police! No one understands why she's with a rat like him. Every night he goes to work out with the other gym rats. Verb The teacher knows what we did, which means that somebody ratted.
Recent Examples on the Web
Noun
But even one rat was too much for some staffers there. Dana Hedgpeth, Washington Post, 8 Sep. 2022 Igartua had gotten several speed camera tickets, Greenberg said, and his letter asked the mayor to put the money from speeding tickets to good use, including to alleviate the rat problem in the alley behind Igartua’s house. Stephanie Casanova, Chicago Tribune, 7 Sep. 2022 Complaints mention drafty windows, a problem with a smoke detector, mold, appliances that don’t function and rat feces. Hartford Courant, 6 Sep. 2022 The same tests were run on rat models with the disease as well as patients suffering from other neurodegenerative and inflammatory diseases. William A. Haseltine, Forbes, 17 Aug. 2022 The yoga aficionado and dedicated gym rat modeled samples from her eponymous clothing line for H&M in the streets of London. Cara Lynn Shultz, Peoplemag, 16 Aug. 2022 During the pandemic, rat sightings have also gone up (or at least more New Yorkers have complained about them). BostonGlobe.com, 6 Aug. 2022 The two team up to fulfill both their dreams, in turn, making the restaurant a success, while figuring out how to navigate the harsh Parisian food critic and rat-loathing head chef that threaten to derail their successes. Nitya Rao, Seventeen, 20 July 2022 This led to a deeper investigation that found rat activity on the first and second floors of the facility. Jodicee Arianna, The Arizona Republic, 11 Aug. 2022 See More

Word History

Etymology

Noun

Middle English rat, ratte, going back to Old English ræt (attested once), akin to Old Saxon ratta "rat," Middle Dutch ratte, rotte, Old High German ratta, radda, ratza (feminine weak nouns), also Old High German rato (masculine weak noun), probably going back to an ablauting paradigm *raþō (nominative), *rattaz/*ruttaz (genitive), *radeni/*rudeni (dative), going back to earlier *(H)rót-ōn, *(H)rt-n-ós, *(H)rt-én-i, of uncertain origin

Note: The origin of the etymon beyond Germanic is obscure. Regionally in German Ratz or Ratze are applied to other animals (as the dormouse and the polecat); if these senses are old, the application of the etymon to rats (Rattus rattus, Rattus norvegicus) may be secondary. Note that if the base is pre-Germanic *rat-, there is no connection to either Latin rōdere "gnaw, nibble, eat away" (see rodent) or rādere "scrape, shave" (see rase), as has often been assumed.

First Known Use

Noun

before the 12th century, in the meaning defined at sense 1a

Verb

1812, in the meaning defined at intransitive sense 1

Time Traveler
The first known use of rat was before the 12th century

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