sell down the river
To betray the true trust or faith of
sell someone down the river
double cross

[TahlilGaran] Dictionary of Contemporary English ▲

sell down the river
sell (someone) down the river
to do something that hurts someone who trusted you.
Workers complained that their leaders sold them down the river in the latest contract negotiations.

Related vocabulary: sell out someone/something

[TahlilGaran] English Idioms Dictionary ▲

sell down the river
v. phr. To give harmful information about someone or something to one's enemies; betray.
The traitor sold his country down the river to the enemy army.
The criminal told the hiding place of his companions and sold them down the river.
Compare: SELL OUT².

[TahlilGaran] English Idioms Dictionary ▲

sell someone down the river
sell (someone) down the river
to do something that hurts someone who trusted you.
Workers complained that their leaders sold them down the river in the latest contract negotiations.

Related vocabulary: sell out someone/something

[TahlilGaran] English Idioms Dictionary ▲