catch someone red-handed

US /kætʃ ˈsʌm.wʌn ˌredˈhæn.dɪd/
UK /kætʃ ˈsʌm.wʌn ˌredˈhæn.dɪd/
"catch someone red-handed" picture
1.

atrapar con las manos en la masa, pillar in fraganti

to discover someone in the act of doing something wrong or illegal

:
The police caught the thief red-handed as he was trying to break into the car.
La policía atrapó al ladrón con las manos en la masa mientras intentaba forzar el coche.
My mom caught me red-handed eating cookies before dinner.
Mi mamá me atrapó con las manos en la masa comiendo galletas antes de la cena.