Definition of first base
- plans never got to first base
a runner on first base
She hit a ground ball to first base.
He used to be a catcher, but now he plays first base.
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'first base.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
baseball : the base that must be touched first by a base runner; also : the position of the player who defends the area around first base
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to lessen the seriousness or strength of
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