Idioms

behind (someone's) back
without someone`s knowledge, secretly
The man is very angry because his friend borrowed his car behind his back.

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  • behind closed doors
  • behind in (something)
  • behind on (something)
  • behind schedule
  • behind the eight ball
  • behind the scenes
  • behind the times
  • belabor the point
  • believe in (someone)
  • believe in (something)
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  • in a quandary
  • out on bail
  • come on strong
  • take in (something) or take (something) in
  • bite the dust
  • in the nude
  • go broke
  • use one's head/bean/noodle/noggin
  • make a long story short
  • pin (something) on (someone)


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