To mount something is to climb onto it or get on top of it, like a horse or a bike. It can also mean to fix something in place, such as putting a picture in a frame or on a wall, or to organize and launch something, like an attack or a campaign.
From Old French *monter* “to go up, to climb,” from Latin *montare* “to mount,” based on *mons, mont-* “mountain.” The connection is the idea of going upward or onto something raised.
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