In American football, a dimeback is a cornerback who serves as the sixth defensive back on defense. This 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. United States simply as football, is a competitive team sport that is both fast-paced and strategic. ... Defensive back (DB) is a player in American football whose role is primarily pass coverage; that is, the defensive back will stay near a receiver and try to deflect or intercept any passes thrown to him. ... The wide receiver (WR) position in American and Canadian football is the pass-catching specialist. ...