'dismount' originates from Old French, specifically the word 'desmonter,' where 'des-' meant 'off' and 'monter' meant 'to mount.'

'desmonter' transformed into the Middle English word 'dismounten,' and eventually became the modern English word 'dismount.'

Initially, it meant 'to get off a horse,' but over time it evolved to include getting off any mount or removing something from its support.