bun /bʌn/ BrE AmE noun [countable]
[ 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 ]
1 . British English a small round sweet cake:
a sticky bun
2 . a small round type of bread:
a hamburger bun
3 .
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 SYN buttocks
5 . have a bun in the oven British English informal to be ↑ pregnant – used humorously