'disobey' originates from Old French, specifically the word 'desobeir', where 'des-' meant 'not' and 'obeir' meant 'to obey'.

'desobeir' transformed into the Middle English word 'disobeyen', and eventually became the modern English word 'disobey'.

Initially, it meant 'not to obey', and this meaning has largely remained the same in modern usage.