Definition & Meaning of "dimeback"

Who is a "dimeback"?

A dimeback is a player on the defensive team in American football who comes into the game when the defense adds a sixth defensive back, typically in situations where the offense is expected to pass. The dimeback's job is to help cover additional receivers and prevent big passing plays. They play a similar role to cornerbacks and nickelbacks but are used when the team wants extra coverage to stop the passing game. Dimebacks need to be quick, skilled at reading the offense, and capable of defending against fast, strong passes.