Definition of "Runner" :

noun: fish of western Atlantic: Cape Cod to Brazil

noun: device consisting of the parts on which something can slide along

noun: a long narrow carpet

noun: (football) the player who is carrying (and trying to advance) the ball on an offensive play

noun: a baseball player on the team at bat who is on base (or attempting to reach a base)

noun: a person who is employed to deliver messages or documents

"He sent a runner over with the contract."

noun: someone who travels on foot by running

noun: a trained athlete who competes in foot races

noun: someone who imports or exports without paying duties

noun: a horizontal branch from the base of plant that produces new plants from buds at its tips