stab sb in the back
to do something harmful to someone who trusted you:
He had been lied to and stabbed in the back by people that he thought were his friends.
See also
backstabber
Thesaurus: synonyms and related words
Disloyalty, betrayal & treason
- adultery
- backstabber
- betray
- betrayal
- break ranks idiom
- collaborate
- deserter
- desertion
- double-cross
- faithless
- false
- fifth column
- high treason
- sell sb down the river idiom
- sellout
- stab
- traitor
- treacherous
- treachery
- treason
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