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Past tense and past participle of undershoot.
1. Driven by water passing from below, as a water wheel.
2. Having the lower jaw or teeth projecting beyond the upper; underhung.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
1. (Anatomy) (of the lower jaw) projecting beyond the upper jaw; underhung
2. (Mechanical Engineering) (of a water wheel) driven by a flow of water that passes under the wheel rather than over it. See overshot
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
un•der•shot(ˈʌn dərˌʃɒt; for 3 also ˌʌn dərˈʃɒt)
1. having the front teeth of the lower jaw projecting in front of the upper teeth, as a bulldog.
2. driven by water passing beneath: an undershot vertical water wheel.v.
3. pt. and pp. of undershoot.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.