Meaning of “jump on sb” in the English Dictionary

british dictionary

"jump on sb" in British English

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jump on sb

phrasal verb with jump uk /dʒʌmp/ us /dʒʌmp/ verb

to criticize someone as soon as they have done something wrong or said something that you disagree with:

She jumps on her children instantly if they're disobedient.

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