bun
Food, Hair & beauty
bun /bʌn/ noun [countableC] 1 British EnglishBrEDF a small round sweet cake 小圆甜糕点
a sticky bun
一个黏糊糊的小圆甜点心
2 DFa small round type of bread 小圆面包
a hamburger bun
用来做汉堡包的圆面包
3. 
DCBif a woman has her hair in a bun, she fastens it in a small round shape at the back of her head 〔盘在脑后的〕圆发髻 →5 see picture at 见图 hairstyle
DCBif a woman has her hair in a bun, she fastens it in a small round shape at the back of her head 〔盘在脑后的〕圆发髻 →5 see picture at 见图 hairstyle4. buns [plural] American EnglishAmE informal the two round parts of a person’s bottom 屁股 SYN buttocks
5. have a bun in the oven BABY/HAVE A BABY British EnglishBrE informal to be pregnant – used humorously 怀孕，有喜〔幽默用法〕
Examples from the Corpus
have a bun in the oven• Do I look like I have a bun in the oven?
Examples from the Corpus
bun• This species looks rather like a bun, but not highly convex, and with a five-sided outline.• Spoon into the choux buns and sprinkle with paprika.• She so obviously hadn't given up stuffing herself with Salmon's cream buns.• Gao Yang counted seven old fingers buried in the steamed bun, which had long since given up its original shape.• The blanched nape of a neck, spiders of hair breaking free of the bun, twirling on the surface.• While the buns were cooking members were divided into teams.
1. (1300-1400) Perhaps from Old French bugne “swelling (caused by a blow), type of fritter”
2. (1800-1900) Perhaps from Scottish Gaelic bun; → BUNNY