What does bun mean?
A bun is a small, round bread roll, typically soft and lightly sweetened, that can be eaten on its own, spread with butter, or split to hold fillings such as burgers or sausages. The word also names a hairstyle in which long hair is gathered and coiled into a rounded knot at the nape of the neck or crown of the head — a style valued for looking tidy and elegant. In casual American speech, 'bun' can additionally refer humorously to the buttocks. Regional vocabulary varies: British speakers may use 'bap', 'cob', or 'roll' where others say 'bun', making the word a familiar marker of local food culture. Its origins trace to early modern English, most plausibly from an Old French term meaning a lump or swelling, which also gave us 'bunion'. Whether describing breakfast pastries like hot cross buns, weekend cookouts, or a dancer's sleek chignon, 'bun' is a warm, homely word tied to comfort food and everyday grooming alike.
A small, round bread roll, often sweetened, eaten plain or split and filled.
"The bakery sells currant buns fresh every morning."
Regional British terms include 'bap', 'cob', and 'batch'; in North America the word strongly suggests hamburger or hot dog rolls.
A knot of hair twisted and coiled into a rounded shape at the back or top of the head.
"The ballerina pinned her bun securely before going onstage."
(Informal) A person's buttocks.
"The toddler slipped on the wet grass and landed right on his bun."
Playful and informal, chiefly American English; not appropriate in formal contexts.
Regular plural; used freely for both the bread sense and the hair/slang senses.
"She picked up a pack of six buns at the bakery."
The word 'bun' likely comes from an Old French word for a lump or bump — so every time you order a burger bun, you are literally eating a little swelling.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of bun
The word 'bun' entered English in the late sixteenth or early seventeenth century, though its ultimate origin is uncertain. The most widely accepted account links it to Old French 'buigne' or 'bugne', meaning a swelling, bump, or lump — the same source that produced 'bunion'. Some older suggestions connected it to Scandinavian words, but this is less firmly established. From its earliest uses denoting a small rounded cake or loaf, the word extended naturally by shape resemblance to the coiled hairstyle, and later developed informal senses.
How bun is actually used
'Bun' is an everyday, informal-to-neutral word. In British English it often means any soft round bread roll (also called a bap or cob regionally), while American usage more strongly associates it with burger and hot dog rolls. The hair sense is standard in both varieties. The slang sense for buttocks is casual and best avoided in formal writing.
Easily confused with bun
A band is a strip or ring of material, whereas a bun is either a small round bread roll or a coiled hairstyle.
A bunch is a group of things gathered together, while a bun is a single bread roll or a coil of hair.