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behind back
behind someone's back
without someone's knowledge; secret from someone. Please don't talk about me behind my back. She sold the car behind his back, while he was away on vacation.
behind your back
when you are not present I often wonder what they say about me behind my back.
behind somebody's back
if you do something behind someone's back, you do it without them knowing, in a way which is unfair I don't want to talk about it behind his back. She was accused of going behind her colleagues' backs to talk to management.
behind (one's) back
In one's absence or without one's knowledge.