go as red as a beetroot
US /ɡoʊ æz rɛd æz ə ˈbiːtruːt/
UK /ɡoʊ æz rɛd æz ə ˈbiːtruːt/

1.
ponerse rojo como un tomate, sonrojarse
to have your face turn a deep red color, usually due to embarrassment or shame
:
•
When she realized her mistake, she went as red as a beetroot.
Cuando se dio cuenta de su error, se puso roja como un tomate.
•
He went as red as a beetroot when his secret was revealed.
Se puso rojo como un tomate cuando se reveló su secreto.