drop a dime on
US /drɑp ə daɪm ɑn/
UK /drɑp ə daɪm ɑn/
1.
告发, 举报
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.
他威胁说，如果得不到更大的份额，就会告发他的同伙。
•
Someone must have dropped a dime on them, that's how the police found out.
一定是有人告发了他们，警察才发现的。