"In American football, the dime defense is a defensive alignment that uses six defensive backs. It is usually employed in obvious passing situations.
The formation usually consists of six defensive backs, usually two safeties and four cornerbacks, and has either four down linemen and one linebacker, or three down linemen and two linebackers. This formation is to prevent the offense from completing a medium to long range pass play. This may be because the offense's running game is inefficient, time is an issue, or they need a long pass for a first down. It is also used against teams whose pass to run ratio predominately favors pass . The formation, however, is vulnerable to running plays as the formation is missing two linebackers, or a linebacker and a down lineman. A dime defense differs from the nickel in that it adds a sixth defensive back to the secondary. This sixth defensive back is called a "dimeback" (D). The defense gets its name because a dime is the next step up in US coin currency from a nickel. There are also 'quarter" and "half-dollar" formations (each protecting against progressively deeper thrown and more likely pass attempts)." [Dime defense. Wikipedia]
The American football positions diagram example "Dime defense" was created using the ConceptDraw PRO diagramming and vector drawing software extended with the Football solution from the Sport area of ConceptDraw Solution Park.