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

1.
cogliere qualcuno in flagrante, prendere qualcuno alla sprovvista
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.
L'insegnante lo ha colto in flagrante mentre giocava al telefono durante la lezione.
•
The sudden inspection caught many employees napping, as they were not following company protocols.
L'ispezione improvvisa ha colto molti dipendenti in flagrante, poiché non seguivano i protocolli aziendali.