Meaning of “put/stick the knife into sb” in the English Dictionary

british dictionary

"put/stick the knife into sb" in British English

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put/stick the knife into sb

also put/stick the knife in

to be unpleasant about someone, or try to harm someone:

The reviewer in the magazine that I read really put the knife in.

(Definition of “put/stick the knife into sb” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)