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

1.
iemand verrassen, iemand betrappen
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.
De leraar betrapte hem toen hij tijdens de les spelletjes op zijn telefoon speelde.
•
The sudden inspection caught many employees napping, as they were not following company protocols.
De plotselinge inspectie betrapte veel werknemers, omdat ze de bedrijfsprotocollen niet volgden.