Meaning of “do the dirty on sb” in the English Dictionary

british dictionary

"do the dirty on sb" in British English

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do the dirty on sb

UK informal

to behave unfairly towards someone, usually without their knowledge:

He can't forgive her for doing the dirty on him and having an affair with his best friend.

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