a player of the team at bat who is on base or is trying to run from one base to another.
- base run·ning, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use base runner in a sentence
Simply put, they believe the risk of losing a base runner is not worth the reward.MLB announces new rules for the minor leagues, including an anti-shift change | Chelsea Janes | March 11, 2021 | Washington Post
A base-runner is out if he interferes with an opponent while the latter is fielding a ball or if he is hit by a batted ball.
For an instant the third base runner hesitated, fearing a caught fly, and that instant cost his side the game.The Bail Jumper | Robert J. C. Stead
The batsman becomes a base-runner the moment he starts for first-base.
Such a ball is snapped from the wrist and should be aimed to catch the base runner who is attempting to steal the base.Outdoor Sports and Games | Claude H. Miller
A base runner should never stop trying to make a base until the ball is in the hands of the baseman.Outdoor Sports and Games | Claude H. Miller