inform on

US /ɪnˈfɔːrm ɑːn/
UK /ɪnˈfɔːrm ɑːn/
"inform on" picture
1.

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.
•
Are you going to inform on your friend for cheating?
:
snitch onrat ontell onblow the whistle onreport
:
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