noun Football.
- (used with a plural verb) the members of the team who, on offense, are stationed behind the linemen and, on defense, behind the linebackers.
- their positions considered as a unit.
- the area where the backs play.
noun American football
- the backfield (sometimes functioning as plural) the quarterback and running backs in a team
- the area behind the line of scrimmage from which the backfield begin each play