Word parts sweat + shirt Pronunciation IPA (key): /ˈswɛtʃəːt/ Audio (US)(file) Noun Singular sweatshirt Plural sweatshirts (countable) A sweatshirt is a loose shirt that is usually made of cotton. It is worn when exercising or as a casual apparel. Wikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads