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behind one's back
01
without one knowing or approving
What is the origin of the idiom "behind one's back" and when to use it?
The origin of the idiom "behind one's back" is not attributed to a specific historical event or source but rather emerges from the metaphorical association of a person's back with their unawareness or lack of visibility. The phrase draws upon the idea that when someone's back is turned or facing away, they cannot see what is happening behind them. It is commonly used when discussing interpersonal relationships, workplace dynamics, or social interactions.
例
The chess grandmaster played against multiple opponents simultaneously, effortlessly winning with one hand behind his back.
The basketball player managed to flip the ball behind his back before making an impressive shot.
Spreading rumors behind her back was a shabby thing to do.
The police officer pinioned the suspect's arms behind their back.
She promised to support my project, but then she stabbed me in the back by working against it behind my back.
