People or things that close something, or in baseball, relief pitchers who finish games by getting the final outs.
Plural of 'closer,' from Old French 'clos' meaning closed. In sports, 'closer' emerged as specialized baseball terminology in the 20th century to distinguish relief pitchers with this specific role.
A baseball closer is paradoxically one of the most pressured and celebrated positions—they pitch only 1-2 innings but their performance determines entire season outcomes, making them the ultimate high-stakes specialists.
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