US usually beet [noun] - the small round dark red root of a plant, which is eaten cooked as a vegetable, esp. cold in saladsShe made a delicious beetroot and apple salad. [U]You have to cook the beetroots before you can eat them. [C]See picture: Vegetables(UK) To go/turn beetroot (red) or go/turn as red as a beetroot or (US) go/turn as red as a beet is to have a red face because you are embarrassed.Whenever I talked about his past life, he would go beetroot.
BEETROOT
Meaning of BEETROOT in English
Cambridge English vocab. Кембриджский английский словарь. 2012