1. Remove something from its mounting or support
   "The technician had to unmount the old security camera before installing the new one";
   - dismount
    
2. (computing) make a hard drive unavailable for use
   "Remember to unmount the external drive before unplugging it";
   - dismount
    
3. (riding) cause a rider to fall from their horse
   "The sudden jump unmounted the inexperienced rider"

Derived forms: unmounted, unmounting, unmounts

Encyclopedia: Unmount