sell someone down the river
• betray someone, especially so as to benefit oneself.
• "he said they were management lackeys who had been sold down the river by Bunker"
Similar:
cheat,
trick,
swindle,
defraud,
dupe,
hoodwink,
double-cross,
betray,
deceive,
sell out,
stab in the back,
exploit,
take advantage of,
do,
con,
take for a ride,
sell,
diddle,
bamboozle,
finagle,
bilk,
rip off,
fleece,
