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

scare (or bore etc.) the pants off someone

phrase

informal
  • Make someone extremely scared (or bored etc.)

    ‘she scared the pants off all who worked with her’
    • ‘It's a fine line between motivating people to stop smoking and scaring the pants off them.’
    • ‘[It has] dialogue to bore the pants off you even if the play were not stretched out beyond endurance.’
    • ‘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.’
    • ‘I promise not to bore the pants off you with my holiday snaps when I come back.’