Hung from above: said of a sliding door when it moves, by means of door-hangers or other appliances, upon a rail at the top. An underhung door is one in which the weight of the door is carried by a rail resting on the floor or by the wall near the base of the door.In mech., having no outboard bearing; hanging on the end of a shaft; hung on or supported by a shaft having a bearing only on one side of the piece which is supported.