Resting on a track at the bottom, instead of being suspended; -- said of a sliding door.

Of an automobile body, suspended from the springs in such a manner that the frame of the chassis is below the axles, the object being to lower the center of gravity of the car.

supported from below especially resting on a track instead of suspended from above; "underhung sliding doors"

Having the lower jaw projecting.

having a lower part projecting beyond the upper; "an underhung jaw"; "undershot bulldog"