Dismount

To come down; to descend.

To alight from a horse; to descend or get off, as a rider from his beast; as, the troops dismounted.

To throw or bring down from an elevation, place of honor and authority, or the like.

To throw or remove from a horse; to unhorse; as, the soldier dismounted his adversary.

To take down, or apart, as a machine.

To throw or remove from the carriage, or from that on which a thing is mounted; to break the carriage or wheels of, and render useless; to deprive of equipments or mountings; -- said esp. of artillery.

the act of dismounting (a horse or bike etc.)