a game played by two teams of 11 players on a rectangular field 100 yards long; teams try to get possession of the ball and advance it across the opponents goal line in a series of (running or passing) plays | (American football) a running play in which a back running in one direction hands the ball to a back running in the opposite direction |
| turning in the opposite direction |
| the gears by which the motion of a machine can be reversed |
| the side of a coin or medal that does not bear the principal design |
| an unfortunate happening that hinders or impedes; something that is thwarting or frustrating |
| a relation of direct opposition |