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

1.
措手不及, 抓到某人偷懶
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.
老師抓到他上課玩手機遊戲。
•
The sudden inspection caught many employees napping, as they were not following company protocols.
突擊檢查讓許多員工措手不及,因為他們沒有遵守公司規定。