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do the dirty on sb

UK informal

Definition

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.Disloyalty, betrayal and treasonCheating and trickingPlotting and trapping
(Definition of do the dirty on sb from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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