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

1.
밀고하다, 고발하다
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.
그는 더 큰 몫을 받지 못하면 공범을 밀고하겠다고 위협했다.
•
Someone must have dropped a dime on them, that's how the police found out.
누군가 그들을 밀고했음에 틀림없어, 그래서 경찰이 알게 된 거야.