drop a dime on

US /drɑp ə daɪm ɑn/
UK /drɑp ə daɪm ɑn/
"drop a dime on" picture
1.

донести на, настучать на

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.
Он угрожал донести на своего сообщника, если не получит большую долю.
Someone must have dropped a dime on them, that's how the police found out.
Кто-то, должно быть, донес на них, вот как полиция узнала.