(As) red as a cherry / (As) red as a poppy / (As) red a rose

Extremely flushed and red in the face, as from embarrassment, anger, or physical strain.

Examples:

  • My father was as red as a cherry by the time we reached the top of the hill. I was afraid he might have a heart attack or something!
  • Oh, Mike definitely likes you - he turns red as a cherry every time you're around!
  • When she came in from ice-skating, Clara's nose was as red as a cherry.
  • When her boss praised her in front of the whole office, Emily turned red as a poppy.