go/turn beetroot (red)

(also go as red as a beetroot , US go beet red , also go as red as a beet)

Definition

to have a red face because you are embarrassed

Whenever I talked about his past life, he would go beetroot.

(Definition of go/turn beetroot (red) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

If a problem preys on your mind, you think about it and worry about it a lot

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