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Webster 1913 Edition

Adj.

(Carp.)

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

Forney.

Having the lower jaw projecting.

T. Hughes.

underhung ‎(not comparable)

hung or suspended from above
(carpentry) Resting on a track at the bottom, instead of being suspended; said of a sliding door.
(Can we find and add a quotation of Forney to this entry?)
Having the lower jaw projecting.
(Can we find and add a quotation of Ted Hughes to this entry?)
- William Makepeace Thackeray
  His jaw was underhung, and when he laughed, two white buckteeth protruded themselves and glistened savagely in the midst of the grin.