First Base Definition
noun
The base to the left of the pitcher, the first of the four bases that a base runner attempts to reach safely.
Webster's New World
The defensive position played by the first baseman.
Webster's New World
The first stage or step toward completion or success.
American Heritage
(singular only, US, colloquial) Kissing.
Wiktionary
Synonyms:
Idioms, Phrasal Verbs Related to First Base
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