- the set of four offensive backs, including the quarterback and some combination of running backs and flankers
- the set of defensive backs, usually three, four, or five, who are primarily responsible for covering the pass receivers
- either of the areas where the backs are positioned
See backfield in American Heritage Dictionary 4
a. The players stationed behind the line of scrimmage.
b. The positions filled by these players.
c. The area in which these players line up.
- Sports The primarily defensive players on a soccer, field hockey, or Rugby team.