Hopefully these pants idioms won't "scare the pants off you!"
No, of course they won't. It's not scary at all and by creating an image of the idiom in your mind it will be easy to remember these in the future.
By the way, if you need a review of what an idiom is, just click here. You can also find many other idiom categories and examples here.
ants in (someone’s) pants: to be very excited, nervous or fidgety (move around a lot).
beat the pants off: to easily win against someone by a large margin or score.
bore the pants off: to be extremely boring or uninteresting to someone else.
catch (someone) with their pants down: to surprise in an embarrassing situation or to find someone doing something wrong.
charm the pants off: to be very charming or appealing to someone.
kick in the pants: someone’s that gets someone’s attention or strongly motivates them to do something.
scare the pants off (someone): to frighten someone a lot.
smarty pants: a person who is annoying because they always have the right answer or know everything.
wear the pants (wear the trousers in British English): to be person in charge of a relationship or marriage.
Okay, time for me to try to give you a kick in the pants.... reading is a great way to learn idioms. Just focus on noticing idioms and trying to understand them. Don't worry about using them in your own speech. Idioms shouldn't scare the pants off you!