'blush' originates from Old English, specifically the word 'blyscan,' where 'blyscan' meant 'to glow or shine.'

'blyscan' transformed into the Middle English word 'blushen,' and eventually became the modern English word 'blush.'

Initially, it meant 'to glow or shine,' but over time it evolved into its current meaning of 'to become red in the face from embarrassment or shame.'