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1867, in the meaning defined above
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From the Editors at Merriam-Webster
Know Your Baseball Idioms
Our national pastime. No, the other one.
Cite this Entry
“Baseball hat.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/baseball%20hat. Accessed 13 Aug. 2022.
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