The word "blush" refers to the reddening of a person's face, often as a result of embarrassment, shame, or shyness. It is a natural physiological reaction that occurs when blood vessels in the face expand, leading to a warm, pinkish hue on the cheeks. People might blush during social situations, when receiving compliments, or when they feel self-conscious.
The word "blush" originates from the Old English word "blūscan," which means "to glow, to shine, or to be red." It has its roots in the Proto-Germanic *bluskōną, which is related to the concept of becoming red or bright.