Other forms: dismounted; dismounting; dismounts
To dismount is to get or climb off of something. An important part of learning to ride a horse is learning how to dismount.
When you ride your bike to work, you'll have to dismount and lock it up before you go inside, and when a gymnast dismounts from the balance beam, she does it with a flourish, sometimes cartwheeling off the end — this move itself is called a dismount. Dismount combines the "opposite of" prefix dis- with the verb mount, or "get up on," from its Latin root mons, "mountain."