1. Football.
   1. An offensive backfield player whose position is behind the quarterback and halfbacks and who primarily performs offensive blocking and line plunges.
   2. The position of this player.
2. Sports.
   1. A primarily defensive backfield player in field hockey, soccer, or Rugby whose position is near the defensive goal or goal line.
   2. The position of this player.

The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.