pants
Pronunciation: /pan(t)s/
plural noun

Phrases
-
catch someone with their pants (or trousers) down
- informal catch someone in an embarrassingly unprepared state: it’s a wonder the government hasn’t been caught with its pants down
-
fly (or drive) by the seat of one's pants
- informal rely on instinct rather than logic or knowledge: I was flying by the seat of my pants because I’d never managed anybody before
-
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

Origin:
mid 19th century: abbreviation of pantaloons (see pantaloon)