BUN Meaning of BUN in English [bun] n [ME bunne] (14c) 1: a sweet or plain small bread; esp: a round roll 2: a knot of hair shaped like a bun 3 pl: buttocks [2]bun n [perh. fr. [1]bun] (1901): load 4. Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012