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English definition of “behind sb's back”

behind sb's back

C2 If you do something behind someone's back, you do it without them knowing , in a way that is unfair : I dread to think what they say about me behind my back.Secrecy and privacy Grammar:BackBack is an adverb, noun, adjective or verb.Grammar:Back as an adverb[taking a photograph]Grammar:Back as a nounGrammar:Back as an adjectiveGrammar:Back as a verb[talking about a pet dog]
(Definition of behind sb's back from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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