NOUN (2)

1. (football) the running back who plays the fullback position on the offensive team;

2. (American football) the position of a back on a football team;


VERB (1)

1. play the fullback;

The Collaborative International Dictionary of English v.0.48:

fullback \fullback\ n.
   an offensive football player who plays farther behind the
   line of scrimmage than the half-back. They are used primarily
   for blocking and line plunges.

   Syn: fullback.
        [WordNet 1.5]

The Collaborative International Dictionary of English v.0.48:

fullback \fullback\ v.
   1. (Football) To play the position of fullback on a football
      team; to be the fullback.
      [WordNet 1.5]

WordNet (r) 3.0 (2006):

fullback
    n 1: (football) the running back who plays the fullback position
         on the offensive team
    2: (American football) the position of a back on a football team
    v 1: play the fullback