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

1.
iemand verraden, iemand in de steek laten
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.
Ik kan niet geloven dat hij me zou verraden na alles wat we hebben meegemaakt.
•
The politician was accused of selling his constituents down the river by voting against their interests.
De politicus werd ervan beschuldigd zijn kiezers te verraden door tegen hun belangen te stemmen.