two-baser has definitions from the field of baseball
1
[ noun ] (baseball) a base hit on which the batter stops safely at second base

Examples

he hit a double to deep centerfield"

Used in print

(Rocky Mountains News, [Denver, Colorado],...)

A double by Green , Allison 's run scoring 2_baser , an infield single by Lemon and Gardner 's solid single to center put the Twins back in_front in the last of the fifth .

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