catch someone with their pants down

US /kætʃ ˈsʌm.wʌn wɪð ðer pænts daʊn/
UK /kætʃ ˈsʌm.wʌn wɪð ðer pænts daʊn/
"catch someone with their pants down" picture
1.

prendre en flagrant délit, prendre au dépourvu

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.
Le patron l'a pris en flagrant délit alors qu'il jouait à des jeux sur son ordinateur pendant les heures de travail.
The sudden inspection caught many employees with their pants down, as they hadn't prepared their reports.
L'inspection soudaine a pris de nombreux employés au dépourvu, car ils n'avaient pas préparé leurs rapports.