WordReference Random House Unabridged Dictionary of American English © 2020
polo shirt′, 
  • Clothinga short-sleeved, pullover sport shirt, usually of cotton or cottonlike knit, with a round neckband or a turnover collar. Also called  polo. 
    • 1915–20

    Collins Concise English Dictionary © HarperCollins Publishers::
    polo shirt n
    1. a knitted cotton short-sleeved shirt with a collar and three-button opening at the neck
    'polo shirt' also found in these entries (note: many are not synonyms or translations):
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