Definition of “rat” - English Dictionary

“rat” in British English

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ratnoun [ C ]

uk /ræt/ us /ræt/

rat noun [ C ] (ANIMAL)

A2 a small rodent, larger than a mouse, that has a long tail and is considered to be harmful:

I think we've got rats (= there are rats in our house).

More examples

  • Bottles of lemonade doctored with rat poison were discovered in the kitchen.
  • In biology classes at school we used to dissect rats.
  • The period of gestation of rats is 21 days.
  • The barn was infested with rats.
  • We put down some poisoned bait to kill the rats.

(Definition of “rat” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

“rat” in American English

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ratnoun [ C ]

us /ræt/

rat noun [ C ] (ANIMAL)

a small animal that looks like a large mouse:

A rat was sniffing around the trash.

rat noun [ C ] (PERSON)

infml an unpleasant person who deceives or is not loyal

(Definition of “rat” from the Cambridge Academic Content Dictionary © Cambridge University Press)