drop a dime on someone

English

Etymology

Referring to the cost of making a phone call, i.e. to the police.

Verb

drop a dime on someone (third-person singular simple present drops a dime on someone, present participle dropping a dime on someone, simple past and past participle dropped a dime on someone)

1. (slang) To inform on (a person); to turn someone in.

Synonyms

• inform, grass up, snitch; See also Thesaurus:rat out