• WordNet 3.6
    • adj underhung having a lower part projecting beyond the upper "an underhung jaw","undershot bulldog"
    • adj underhung supported from below especially resting on a track instead of suspended from above "underhung sliding doors"
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Webster's Revised Unabridged Dictionary
    • Underhung Having the lower jaw projecting.
    • a Underhung 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.
    • Underhung (Carp) Resting on a track at the bottom, instead of being suspended; -- said of a sliding door.
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Century Dictionary and Cyclopedia
    • underhung Suspended or hung in such a manner that the elements which carry the weight or load are below the load they carry, but the links connecting the two are in tension. Said of locomotives or motor vehicles in which the springs are below the frame and are hung from the axles, the spring-ends being connected to the frame by compression elements, instead of the reverse of this system, which exists in over-hung constructions. D. K. Clark, Railroad Mach., p. 207.
    • underhung Projecting beyond the upper jaw: applied to the under jaw.
    • underhung Having the under jaw projecting beyond the upper jaw.
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Chambers's Twentieth Century Dictionary
    • adj Underhung un-dėr-hung′ hanging over, protruding from beneath: running on rollers on a rail below it—of a sliding-door—opp. to Overhung.
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In literature:

His tawny beard concealed a jaw underhung, a chin jutting and dangerous.
"Famous Affinities of History V1" by Lyndon Orr
His tawny beard concealed a jaw underhung, a chin jutting and dangerous.
"Famous Affinities of History, Vol 1-4, Complete" by Lyndon Orr
The others eyed him from serious, underhung faces.
"The Imperialist" by (a.k.a. Mrs. Everard Cotes) Sara Jeannette Duncan
His mouth was underhung, giving him a pugnacious and bad-tempered appearance.
"The Red Redmaynes" by Eden Phillpotts
His jaw was heavy and slightly underhung, and his neck was thick and coarse.
"The Argosy" by Various
The underhung jaw of the prizefighter shot out.
"Steve Yeager" by William MacLeod Raine
Silvestro was hand in hand with Petruccio and another boy, called Mastino because he was heavy-jowled and underhung.
"Little Novels of Italy" by Maurice Henry Hewlett
Montano describes them as having flat, broad noses, underhung jaws, and receding foreheads, giving them an appearance of stupidity.
"The Inhabitants of the Philippines" by Frederic H. Sawyer
The ling or fresh-water cod has an underhung, somewhat shark-like mouth, not unsuggestive of the new moon with its points turned downward.
"Down the Columbia" by Lewis R. Freeman
The temple is hollow, the cheek-bones are prominent, the jaw is strong, and the chin very underhung.
"The Little Gleaner, Vol. X." by Various

In poetry:

Instead of which you sit there and roll your head like a
And show a tiny bunch of white teeth in your underhung
Self-conscious little bitch,
Aiming again at being loved.
"Bibbles" by D H Lawrence