betray
verb
[ bɪˈtreɪ ]
• expose (one's country, a group, or a person) to danger by treacherously giving information to an enemy.
• "a double agent who betrayed some 400 British and French agents to the Germans"
Similar:
break one's promise to,
be disloyal to,
be unfaithful to,
break faith with,
play someone false,
fail,
let down,
double-cross,
deceive,
cheat,
inform on/against,
give away,
denounce,
sell out,
stab someone in the back,
be a Judas to,
give someone a Judas kiss,
bite the hand that feeds one,
turn traitor,
sell the pass,
turn Queen's/King's evidence,
blow the whistle on,
rat on,
peach on,
sell down the river,
squeal on,
squeak on,
grass on,
shop,
sneak on,
stitch up,
do the dirty on,
split on,
rat out,
drop a/the dime on,
finger,
job,
dob on,
pimp on,
pool,
shelf,
put someone's pot on,
point the bone at,
delate,
Opposite:
be loyal to,
• unintentionally reveal; be evidence of.
• "she drew a deep breath that betrayed her indignation"
Origin:
Middle English: from be- ‘thoroughly’ + obsolete tray ‘betray’, from Old French trair, based on Latin tradere ‘hand over’.
