Cosy/ˈkəʊzi/ Definition 1 of 3Pro Tip 1/3Physical Comfort Use 'cosy' to describe small spaces that give a sheltered and snug feeling. The tiny cabin was surprisingly cosy. Pro Tip 2/3Warmth in Weather 'Cosy' often refers to how warm clothing or places feel in cold weather. She wore a cosy sweater during the winter. Pro Tip 3/3Not Spacious 'Cosy' can imply that a place is small or compact without any negative connotation. We rented a cosy apartment with a lovely view.