drop a dime

Etymology
See dime § Etymology 2

Verb

 * 1)  To make a telephone call.
 * 2)  To inform, to call the authorities (on).
 * He was in the back for a few minutes. Turned out he was dropping a dime on Ralph.
 * He was in the back for a few minutes. Turned out he was dropping a dime on Ralph.
 * He was in the back for a few minutes. Turned out he was dropping a dime on Ralph.

Synonyms

 * ,, ; See also Thesaurus:rat out

Related terms

 * dime on
 * dime on