scare the pants off
To scare or startle someone thoroughly.
He liked the water rides, but the big roller-coaster scared the pants off him.
scare
UK /skɛə/ US /skɛɚ/
noun 3verb 2adj 1
Definitions
noun
1
A minor fright.
Johnny had a bad scare last night.
England were held to a draw after surviving a major scare against Switzerland as they were forced to come from two goals behind to earn a point in the Euro 2012 qualifier at Wembley.
2
A cause of terror or alarm; a panic; something that inspires fear or dread.
a food-poisoning scare
3
A device or object used to frighten.
But I admit the possibility of their being used as "scares" for either birds of prey or snakes, or both.
verb
1
To frighten, terrify, startle, especially in a minor way.
Did it scare you when I said "Boo!"?
That cannot be; the noise of thy crossbow / Will scare the herd, and so my shoot is lost.
2
(To be able) to be scared.
I don't scare easily.
adj
1
lean; scanty
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