As a Noun: 1. A knitted woollen sweater that you fasten at the front with buttons or a zip. English = cardigan. 2. A sleeveless piece of clothing with buttons, which you wear on the top part of your body. Men often wear them over their shirts and under their jackets. English = vest, waistcoat. As a Verb or Adjective: 1. To put on or wear a cardigan. 2. To put on or wear a vest.