Definitions

1. adjective

comfortably and attractively warm and snug; pleasant and relaxing

“The fireplace made the room feel very cosy on a cold winter’s night.”

2. noun

a small, enclosed space, typically with a roof, used as a shelter or a place to rest

“The cosy was a small tent that could be set up in the back garden.”

3. verb

to make something feel warm and snug

“She cosied up to the fireplace with a good book.”