undershot

(-s̸hät′)

adjective

  1. with the lower part or half extending past the upper: an undershot jaw
  2. driven by water flowing along the lower part: an undershot water wheel

See undershot in American Heritage Dictionary 4

verb
Past tense and past participle of undershoot.
adjective (ŭnˈdər-shŏtˌ)
  1. Driven by water passing from below, as a water wheel.
  2. Having the lower jaw or teeth projecting beyond the upper; underhung.

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