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Sense: 1-3, 5
Date: 1300-1400
Origin: Perhaps from Old French bugne 'swelling (caused by a blow), type of fritter'
Sense: 4
Date: 1800-1900
Origin: Perhaps from Scottish Gaelic bun; BUNNY

bun

noun
     
Related topics: Hair and Beauty, Food
bun [countable]
1 British EnglishDF a small round sweet cake:
a sticky bun
2DF a small round type of bread:
a hamburger bun
bun
3DCB if a woman has her hair in a bun, she fastens it in a small round shape at the back of her head
4

buns

[plural] American English informal the two round parts of a person's bottom [= buttocks]
5

have a bun in the oven

British English informal to be pregnant - used humorously

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