sell someone down the river
US /sel ˈsʌm.wʌn daʊn ðə ˈrɪv.ər/
UK /sel ˈsʌm.wʌn daʊn ðə ˈrɪv.ər/

1.
배신하다, 팔아넘기다
to betray someone for one's own benefit, especially someone who trusts you
:
•
I can't believe he would sell me down the river after all we've been through.
우리가 겪은 모든 일 후에 그가 나를 배신할 줄은 믿을 수 없어.
•
The politician was accused of selling his constituents down the river by voting against their interests.
그 정치인은 유권자들의 이익에 반하는 투표를 함으로써 그들을 배신했다는 비난을 받았다.