'unsaddle' originates from Middle English, specifically the prefix 'un-' meaning 'reverse action' and 'saddle' from Old English 'sadol', meaning 'seat for a rider'.

'unsaddle' changed from the Middle English word 'unsadlen' and eventually became the modern English word 'unsaddle'.

Initially, it meant 'to remove a saddle', and this meaning has largely remained the same in modern usage.