Resting on a track at the bottom, instead of being suspended; -- said of a sliding door. Forney. [1913 Webster]
Having the lower jaw projecting. T. Hughes. [1913 Webster]
underhung, a.
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. [Webster 1913 Suppl.]