Past tense of blush; to turn red in the face, usually from embarrassment, shyness, or strong emotion.
From Old English 'blyscan' meaning 'to become red or confused.' The word is related to 'blaze' and originally referred to the reddening of the face from internal feelings.
Blushing is one of the few physical reactions humans can't fully control or fake—Charles Darwin wrote an entire book called 'The Expression of Emotions in Man and Animals' that singled out blushing as uniquely human, since it reveals our true emotional state.
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