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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
It's frustrating when people criticize your work behind your back or while your back is turned.
They made important decisions about the project behind my back, and I feel left out of the process.
The police officer pinioned the suspect's arms behind their back.
He didn't appreciate it when his coworkers took his name in vain by making jokes about him behind his back.
He was disloyal to his best friend by spreading rumors behind his back.
