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red as a beetroot

Blushing, usually from embarrassment. I was red as a beetroot when the teacher made me speak in front of the whole class. Oh, Mike definitely likes you—he turns red as a beetroot every time you're around!
See also: beetroot, red

go beetroot (red)

  (British & Australian) also go as red as a beetroot (British & Australian)
to become very red in the face, usually because you are embarrassed
Usage notes: A beetroot is a small, round vegetable that is a very dark red/purple colour.
Whenever the kids asked him about his girlfriend he'd go beetroot.
See also: beetroot