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to stab sb in the back
01
to be disloyal and ungrateful to someone who has trusted or supported one
![to [stab] {sb} in the back definition and meaning](https://cdn.langeek.co/photo/44598/original/?type=jpeg "to [stab] {sb} in the back definition and meaning")
What is the origin of the idiom "stab someone in the back" and when to use it?
The idiom "stab someone in the back" has origins that date back centuries and are rooted in the idea of treachery and betrayal. The expression draws a vivid image of someone being betrayed by a close friend or ally who literally stabs them from behind, catching them off guard. It is used to describe an act of betrayal or treachery by someone who was previously considered a friend, ally, or trusted individual. It suggests that the betrayal was done secretly or behind the person's back, without their knowledge or awareness.
例
She promised to support my project, but then she stabbed me in the back by working against it behind my back.
I trusted you but you stabbed me in the back.
The political candidate claimed to be loyal to his party, but he stabbed them in the back by switching sides right before the election.
I thought we were close friends, but he stabbed me in the back by spreading rumors about me.
His business partner stabbed him in the back by stealing company secrets and starting a rival company.
