backfield

noun5

1. •
   The rear part of the field of play.
2. •
   The area behind the line of scrimmage occupied before the snap by the team on offense.
3. •
   (US) The area behind either the offensive or defensive line.

   • Moving the ball directly out of the backfield is the greatest form of attack there is. — 2000
4. •
   (rare) Synonym of outfield.
5. •
   The players occupying this area.

   • Maryland's football team practiced for the third straight day yesterday without its starting backfield. — 1983