(baseball) The base after home plate in a counter-clockwise path around a baseball infield.
The runner took his lead off first base.
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(singulare tantum, by extension) Completion of the first phase of an activity.
I got to first base with Danny, and hope to get him naked this weekend.
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(singulare tantum, US, colloquial) Kissing, regarded as the first phase of a sexual relationship.
The runner took his lead off first base.
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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
See all Regional & Other slang on Slangora.