Dimeback

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In American football, a dimeback is a cornerback who serves as the sixth defensive back 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.

Usually, dimebacks are brought onto the field before plays that have a good possibility of becoming pass plays. Usually, a linebacker is substituted for a cornerback in order to gain better pass defense.