drop a dime on
US /drɑp ə daɪm ɑn/
UK /drɑp ə daɪm ɑn/

1.
melaporkan, mengadu
to inform the police or other authorities about someone's illegal activities
:
•
He threatened to drop a dime on his accomplice if he didn't get a larger share.
Dia mengancam akan melaporkan rekannya jika dia tidak mendapatkan bagian yang lebih besar.
•
Someone must have dropped a dime on them, that's how the police found out.
Pasti ada yang melaporkan mereka, begitulah polisi mengetahuinya.