underhung

From under- +‎ hung.

underhung (not comparable)

1. Hung or suspended from above.
2. Having the lower jaw projecting.
   • 1859–1861, [Thomas Hughes], “A Row on the River”, in Tom Brown at Oxford: […], part 1st, Boston, Mass.: Ticknor and Fields, published 1861, →OCLC, page 23:

     [H]e was marked with small-pox, had large features, high cheek-bones, deeply set eyes, and a very long chin; and had got the trick which many underhung men have of compressing the upper lip.

   • 1847 January – 1848 July, William Makepeace Thackeray, “The Subject Continued”, in Vanity Fair […], London: Bradbury and Evans […], published 1848, →OCLC, page 336:

     His jaw was underhung, and when he laughed, two white buck-teeth protruded themselves and glistened savagely in the midst of the grin.

3. Of a sliding door: resting on a track at the bottom, instead of being suspended.
   • 1919, Marshall Monroe Kirkman, Cars, Their Construction and Handling, page 383:

     Usually, [railroad] car doors slide on the top door-track, being then termed overhung doors; the underhung door being one supported and sliding on a rail below the door.