Meaning of “behind sb's back” in the English Dictionary

british dictionary

"behind sb's back" in British English

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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.

(Definition of “behind sb's back” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)