catch someone napping
US /kætʃ ˈsʌm.wʌn ˈnæp.ɪŋ/
UK /kætʃ ˈsʌm.wʌn ˈnæp.ɪŋ/

1.
방심한 틈을 타다, 딱 걸리다
to surprise someone when they are not prepared for something, especially when they are not paying attention or are doing something they shouldn't be doing
:
•
The teacher caught him napping when he was playing games on his phone during class.
선생님이 그가 수업 중에 휴대폰으로 게임을 하는 것을 딱 걸렸다.
•
The sudden inspection caught many employees napping, as they were not following company protocols.
갑작스러운 검사는 회사 규정을 따르지 않던 많은 직원들을 당황하게 했다.