Definition of base runner in English:

base runner

Syllabification: base run·ner

Entry from US English dictionary

(also baserunner)

noun

Baseball
A player on the team at bat who is on a base, or running between bases.

Derivatives

base-running

(or baserunning) noun

Definition of base runner in:

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Word of the day flagitious
Pronunciation: fləˈdʒɪʃəs
adjective
(of a person or their actions) criminal; villainous