from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A usually long-sleeved, collarless, oversize pullover made traditionally of heavy cotton jersey that has a fleeced backing.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun A loose shirt, usually made of a knit fleece, for athletic wear and now often used as casual apparel.
  • noun A shirt worn against the skin, usually under other clothing, to absorb sweat.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun cotton knit pullover with long sleeves worn during athletic activity


from Wiktionary, Creative Commons Attribution/Share-Alike License

From sweat +‎ shirt.


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