Meaning of “two can play at that game” in the English Dictionary

british dictionary

"two can play at that game" in British English

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two can play at that game

informal

something that you say when you intend to harm someone in the same way as they harmed you:

When I found out that my husband had been having an affair, I thought "two can play at that game!"

(Definition of “two can play at that game” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)