Got off a horse or removed something from its position; or describing something that is no longer mounted on a support.
From Old French desmonter, combining des- (undo) and monter (to mount). First used in English around 1400 to describe getting off a horse.
In medieval cavalry warfare, a 'dismounted knight' was incredibly dangerous—they'd often fight on foot with pikes or swords, sometimes even more effectively than on horseback.
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