rat definition, meaning - what is rat in the British English Dictionary & Thesaurus - Cambridge Dictionaries Online

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English definition of “rat”

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rat

noun [C] uk   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: Rats carry disease. I think we've got rats (= there are rats in our house).
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rat noun [C] (PERSON)

informal an unpleasant person who deceives others or is not loyal
(Definition of rat from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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