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to do the dirty on somebody
01
to purposely cause a person harm or deceive them, often when they do not expect it
Dialect
British
British
![to [do] the dirty on {sb} definition and meaning](https://cdn.langeek.co/photo/44598/original/?type=jpeg "to [do] the dirty on {sb} definition and meaning")
Example
He ca n't forgive her for doing the dirty on him and having an affair with his best friend.
He really did the dirty on her.
