an act that harms sb, done by a person they thought was a friend; to do or say sth that harms sb who trusts you
a stab in the backinformal
an act that harms sb, done by a person they thought was a friend
stab sb in the back
to do or say sth that harms sb who trusts you
Definiciones del Oxford Advanced Learner's Dictionary, 9.ª edición