American English

Definition of bun noun from the Oxford Advanced American Dictionary



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  1. 1[countable] a small, round, flat type of bread a hamburger bun compare roll
  2. 2[countable] a small, round, sweet cake a cinnamon bun a sticky bun see also hot cross bun
  3. 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. 4buns [plural] (informal) the two sides of a person's bottom
  5. Idioms
    have a bun in the oven (informal) (humorous)
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    to be pregnant
See the Oxford Advanced Learner's Dictionary entry: bun

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