do the dirty on sb Definition in British English Dictionary
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Definition of "do the dirty on sb" - British English Dictionary

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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.
Translations of “do the dirty on sb”
in Chinese (Traditional) 給(某人)背地裡使壞,對(某人)偷偷使壞…
in Chinese (Simplified) 给(某人)背地里使坏,对(某人)偷偷使坏…
(Definition of do the dirty on sb from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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