"Drop a dime" is often used as a slang term (euphemism) in reference to a basketball assist - a pass to another teammate that leads to a made basket. There is an obvious parallel between this usage and the usage in the context of a payphone call - as one player is "connecting" with the other player by passing the ball. read more
drop a dime To snitch or inform on someone to a person of higher authority. Originally street slang for informing to police, it refers to the old price of using a public payphone (10 cents). read more