turns red in the face, usually from embarrassment, heat, or anger; or rinses something with a lot of water.
From Middle English 'flushen,' possibly from Old Norse or Scandinavian sources. Originally meant to rush or flow; evolved to describe both the reddening of skin and the flushing away of liquids.
Your face flushes red when you're embarrassed because your body is doing the opposite of what would help you hide—it's actually an evolutionary leftover that makes it impossible to hide your feelings!
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