dis·mount 
(dĭs-mount)
(dĭs-mount)v. dis·mount·ed, dis·mount·ing, dis·mounts
v.intr.
1. To get down from a horse or other steed.
2. To step off or down from: dismounted from the cart; dismounted from the stool.
3. Sports To execute a dismount in gymnastics.
v.tr.
1. To unseat or throw off, as from a horse.
2. To step off or down from: "The kid nearly collapsed after dismounting his bike" (Davis Phinney).
3. To remove from a support, setting, or mounting.
4. To disassemble (a mechanism, for example).
n. (dĭsmount′)
1. The act or manner of dismounting, especially from a horse.
2. Sports A move in gymnastics whereby the gymnast gets off an apparatus or completes a floor exercise, typically landing on both feet.
[Probably alteration of obsolete French desmonter, to unseat : des-, dis- + monter, to mount; see MOUNT1.]
dis·mounta·ble adj.