'disarm' originates from Old French, specifically the word 'desarmer,' where 'des-' meant 'away' and 'armer' meant 'to arm.'

'desarmer' transformed into the Middle English word 'disarmen,' and eventually became the modern English word 'disarm.'

Initially, it meant 'to take away weapons,' but over time it evolved into its current meaning of 'to make harmless or less hostile.'