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English definition of “rat on sb/sth”

rat on sb/sth

phrasal verb with rat     /ræt/ verb slang disapproving
to not be loyal to someone, especially by giving away secret information about them, or to fail to do something that you said you would do: He ratted on us. They ratted on the deal .Revealing secrets and becoming known
(Definition of rat on sb/sth from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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