What it is

A dime back is the sixth defensive back on the field. The first extra defender is the nickel back, and the dime is the next one.

In a game

A defense uses the dime package when the offense has four or five receivers, especially on third and long. It trades run protection for coverage.

More detail

The extra back usually replaces a linebacker, so the defense is lighter. A dime package is weaker against the run, so offenses may try a draw play against it.

Animated diagram

1. On third and long the offense will probably pass, so the defense brings in a sixth defensive back.
2. He takes the place of a linebacker and covers a slot receiver.
3. With more defenders in the secondary, there are fewer open receivers, but the run defense is weaker.