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behind back

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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.

See also: back, behind

behind your back

when you are not present I often wonder what they say about me behind my back.

See also: back, behind

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.

See also: back, behind

behind (one's) back

In one's absence or without one's knowledge.

See also: back, behind