[UNDER-1 4 a. Cf. UNDERHUNG ppl. a.] Projection, protrusion (of the lower jaw).
1842. Youatt, Dog, iv. (1845), 99. A second cross considerably lessens the underhanging of the lower jaw.
1876. T. Bryant, Pract. Surg. (ed. 2), I. 515. In some cases complete underhanging of the jaw is present.