'detachable' originates from the verb 'detach,' which comes from the Old French word 'detacher,' where 'de-' meant 'off' and 'tacher' meant 'to fasten.'

'detacher' transformed into the Middle English word 'detachen,' and eventually became the modern English word 'detach.'

Initially, it meant 'to unfasten or separate,' and this meaning has largely remained the same in modern usage.