bun [bunbuns] BrE [bʌn] NAmE [bʌn] noun 1. countable (BrE)a small round sweet cake •an iced bun see also ↑hot cross bun 2. countable (BrE also bap)a small round flat bread roll •a hamburger bun compare ↑roll 3. countable long hair that has been twisted into a round shape and is worn on top or at the back of the head •She wore her hair in a bun. 4.bunsplural (slang, especially NAmE)the two sides of a person's bottom Idiom: ↑have a bun in the oven See also: ↑bap
Word Origin: late Middle English: of unknown origin.
Example Bank: •She pulled her hair back into a messy bun. •a woman with her hair in a loose bun
