- dime-dropper
- n. an informer. (Underworld. Because an informer at one time could drop a dime in a public telephone and call the police or drop a dime on the sidewalk as a signal for the police to move in and make an arrest. See also drop a dime.)□ I think that Tracy is the dime-dropper who caused the roust.□ The fuzz protects its dime-droppers with everything they’ve got.
Dictionary of American slang and colloquial expressions. 2015.