In baseball, a hit that goes through the gap between outfielders; something or someone that creates or widens gaps.
From 'gap' plus the agent suffix '-er' (meaning 'one who does'). Baseball terminology developed 'gapper' in the late 20th century to describe this specific type of hit.
A 'gapper' in baseball is a hitter's dream—it's almost impossible to catch because it lands in that perfect space where no fielder can reach it, and the batter usually gets a double out of it.
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