inform on
US /ɪnˈfɔːrm ɑːn/
UK /ɪnˈfɔːrm ɑːn/

1.
melaporkan, memberi tahu
to give information to the police or other authority about someone's illegal or wrong activities
:
•
He decided to inform on his accomplices to get a lighter sentence.
Dia memutuskan untuk melaporkan kaki tangannya untuk mendapatkan hukuman yang lebih ringan.
•
Are you going to inform on your friend for cheating?
Apakah kamu akan melaporkan temanmu karena mencontek?