Dimeback

The "dime" defense (4 cornerbacks), lined up against 4 wide receivers on offense

In American football, a dimeback is a cornerback who serves as the sixth defensive back (fourth cornerback) on defense. The third cornerback on defense is known as a nickelback. The dimeback position is essentially relegated to backup cornerbacks who do not play starting cornerback positions. Dimebacks are usually fast players because they must be able to keep up on passing plays with 3+ wide receivers.

Dimebacks are brought into the game when the defense uses a "Dime" formation, which utilizes six defensive backs rather than four or five. Usually, a dimeback replaces a linebacker in order to gain better pass defense.

Positions in American football and Canadian football
Offense			Defense			Special teams
Linemen	Guard, Tackle, Center		Linemen	Tackle, End, Nose tackle		Kicking players	Placekicker, Punter, Kickoff specialist
Quarterback			Linebackers			Snapping	Long snapper, Holder
Backs	Halfback (Tailback), Fullback, H-back		Backs	Cornerback, Safety		Returning	Punt returner, Kick returner
Receivers	Wide receiver, Tight end, Slotback			Nickelback, Dimeback		Tackling	Gunner
Formations – Nomenclature