sweatshirt Syllabification: (sweat·shirt)Pronunciation: /ˈswetˌSHərt/Translate sweatshirt | into French | into German | into Italian | into Spanish Definition of sweatshirt noun a loose, heavy shirt, typically made of cotton, worn when exercising or as leisurewear. sweatshirt in other Oxford dictionaries Definition of sweatshirt in the British & World English dictionary