double-cross
verb
[ ˌdʌb(ə)lˈkrɒs ]
• deceive or betray (a person with whom one is supposedly cooperating).
Similar:
betray,
cheat,
defraud,
trick,
hoodwink,
mislead,
deceive,
swindle,
break one's promise to,
be disloyal to,
be unfaithful to,
break faith with,
play false,
fail,
let down,
two-time,
sell down the river,
stitch up,
do the dirty on,
Opposite:
be loyal,
play it straight,
double-cross
noun
• a betrayal of someone with whom one is supposedly cooperating.
• "the firm's representative claimed that the outside deal was a double-cross"
