(ppl.) a. (and sb.). [UNDER-1 4 a.]
1. Driven by water passing under.
Undershot wheel, a water-wheel turned by force of water acting on the lower part of the wheel. Undershot mill, a mill worked by an undershot wheel.
1610. R. Vaughan, Water-Workes, P 3. To plant an vndershot-mil vpon a Riuer.
1660. R. D’Acres, Art Water-drawing, 28. The close bucketted wheels … are of three sorts, the close bucketted under-shot, which receive their charge below [etc.].
1759. Phil. Trans., LI. 125. The undershot-wheel was taken off the axis, and … an overshot wheel … was put into its place.
1805. Brewster, Ferguson’s Lect., I. 81. Water mills are divided into breast mills, undershot mills, and overshot mills.
1872. H. W. Beecher, Lect. Preaching, viii. 149. If you have a great, full strong stream,… then the wheel is made under-shot.
b. sb. An undershot wheel or mill.
1705. S. Carpenter, Lett., in Penn & Logan, Corr. (1870), I. 233. After it has passed through the saw-mill it comes to the corn-mill, an undershot, and grinds very well.
1759. Phil. Trans., LI. 137. All those that receive the impulse or shock of the water, whether in an horizontal, perpendicular, or oblique direction, are to be considered as undershots.
2. Having the lower jaw or teeth projecting beyond the upper; underhung.
1881. V. Shaw, Bk. Dog, 39. Undershot, the lower incisor teeth projecting beyond the upper, as in Bulldogs.
1884. Live Stock Jrnl., Aug., 130. The second prize-winner is leggy, with straight shoulders, not good face, and is undershot.
