A cosmetic product applied to the cheeks to add color, or a person who blushes easily.
Blush + -er. 'Blush' comes from Old English blyscan (to redden). The cosmetic product meaning emerged in the 20th century.
The reddening of cheeks when embarrassed is involuntary—your body releases adrenaline that dilates blood vessels, which is why it's nearly impossible to fake a genuine blush.
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