catch someone with their pants down
US /kætʃ ˈsʌm.wʌn wɪð ðer pænts daʊn/
UK /kætʃ ˈsʌm.wʌn wɪð ðer pænts daʊn/

1.
허를 찌르다, 방심한 틈을 타다
to discover someone doing something wrong or embarrassing, or to find them unprepared for something
:
•
The boss caught him with his pants down when he was playing games on his computer during work hours.
상사는 그가 근무 시간에 컴퓨터로 게임을 하고 있을 때 그의 허를 찔렀다.
•
The sudden inspection caught many employees with their pants down, as they hadn't prepared their reports.
갑작스러운 검사는 많은 직원들이 보고서를 준비하지 않아 허를 찔렀다.