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

british dictionary

"be on sb's back" in British English

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be on sb's back

informal

to criticize someone several times in an annoying way:

She's on my back again about those sales figures - I just haven't had a moment to do them.

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