Definition of scare or bore etc. the pants off someone in English:

scare (or bore etc.) the pants off someone

informal Make someone extremely scared (or bored etc.): she scared the pants off all who worked with her
More example sentences
  • It's a fine line between motivating people to stop smoking and scaring the pants off them.
  • If there is one category of horror movies that scares the pants off me, it's zombies, and this remake certainly got me jumping and twitching in my seat.
  • There is a class of person who delights in trying to scare the pants off you with appalling tales of child-rearing horror.
See parent entry: pants

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Pronunciation: ɪnˈvɛnəm
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put poison on or into; make poisonous