'flinch' originates from Old French, specifically the word 'flenchir,' where 'flenchir' meant 'to turn aside or retreat.'

'flinch' changed from the Old French word 'flenchir' and eventually became the modern English word 'flinch.'

Initially, it meant 'to turn aside or retreat,' but over time it evolved into its current meaning of 'to make a quick, nervous movement.'