do the dirty on sb
UK informalto 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.
Thesaurus: synonyms and related words
Disloyalty, betrayal & treason
- adultery
- backstabber
- betray
- betrayal
- break ranks idiom
- collaborate
- deserter
- desertion
- faithless
- false
- fifth column
- high treason
- inconstant
- sellout
- stab
- stab sb in the back idiom
- traitor
- treacherous
- treachery
- treason
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You can also find related words, phrases, and synonyms in the topics:
Cheating & tricking