Also found in: Thesaurus.
A member of the team at bat who has safely reached or is trying to reach a base.
base′run′ning (bās′rŭn′ĭng) n.
a baseball player of the team at bat who is on base or is trying to run from one base to another.
base′ run`ning, n.
Switch to new thesaurus
|Noun||1.||base runner - a baseball player on the team at bat who is on base (or attempting to reach a base)|
baseball, baseball game - a ball game played with a bat and ball between two teams of nine players; teams take turns at bat trying to score runs; "he played baseball in high school"; "there was a baseball game on every empty lot"; "there was a desire for National League ball in the area"; "play ball!"