dis·mount / disˈmount/ • v. 1. [intr.] alight from a horse, bicycle, or other thing that one is riding. ∎  [tr.] cause to fall or alight.2. [tr.] remove (something) from its support: we have to dismount the pump. ∎  Comput. make (a disk or disk drive) unavailable for use.• n. Gymnastics a move in which a gymnast jumps off an apparatus or completes a floor exercise: on the uneven bars the women go for ever more complex dismounts.

dismount remove (a thing) from that on which it has been mounted; come down, esp. alight from a horse, etc. XVI. f. DIS- 3 + MOUNT 2.