Definition of "cosy"

cosy

/ˈkəʊzi/

adjective
comparative cosier, superlative cosiest
1. Affording comfort and warmth; snug; social.
  Quotations
  after Mr. Bob Sawyer had informed him that he meant to be very cosy, and that his friend Ben was to be one of the party, they shook hands and separated
  1836 March – 1837 October, Charles Dickens, chapter 30, in The Posthumous Papers of the Pickwick Club, London: Chapman and Hall, […], published 1837
2. Warm and comfortable.
noun
plural cosies
1. A padded or knit covering put on an item to keep it warm, especially a teapot or egg.
2. A padded or knit covering for any item (often an electronic device such as a laptop computer).
3. A work of crime fiction in which sex and violence are downplayed or treated humorously, and the crime and detection take place in a small, socially intimate community.
verb
third-person singular simple present cosies, present participle cosying, simple past and past participle cosied
1. To become snug and comfortable.
2. To become friendly with.