behind back


behind (one's) back

In one's absence. The phrase typically suggests wrongdoing or deceit. I can't believe you were gossiping about me behind my back! Tom will be upset that we already made the decision behind his back.See also: back, behind

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 (one's) back

In one's absence or without one's knowledge.See also: back, behind