From WordNet (r) 3.0 (2006):
runner
n 1: someone who imports or exports without paying duties [syn:
smuggler, runner, contrabandist, moon curser,
moon-curser]
2: someone who travels on foot by running
3: a person who is employed to deliver messages or documents;
"he sent a runner over with the contract"
4: a baseball player on the team at bat who is on base (or
attempting to reach a base) [syn: base runner, runner]
5: a horizontal branch from the base of plant that produces new
plants from buds at its tips [syn: stolon, runner,
offset]
6: a trained athlete who competes in foot races
7: (football) the player who is carrying (and trying to advance)
the ball on an offensive play [syn: ball carrier, runner]
8: a long narrow carpet
9: device consisting of the parts on which something can slide
along
10: fish of western Atlantic: Cape Cod to Brazil [syn: runner,
blue runner, Caranx crysos]