• (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. • (a.) Having the lower jaw projecting. • (a.) Resting on a track at the bottom, instead of being suspended; -- said of a sliding door.Underhung: words... Found on http://thinkexist.com/dictionary/meaning/underhung/