sell sb down the river
informalto put someone in a difficult or dangerous situation by not acting as you had promised to act, usually in order to win an advantage for yourself
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
- sellout
- stab
- stab sb in the back idiom
- traitor
- treacherous
- treachery
- treason
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