Meaning of “get your own back (on sb)” in the English Dictionary

british dictionary

"get your own back (on sb)" in British English

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get your own back (on sb)

UK informal

C2 to do something unpleasant to someone because they have done something unpleasant to you:

I'll get my own back on her one day.

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