Undershot
/ˈʌn.də(ɹ)ˌʃɒt/
verb
To shoot not far enough or not well enough.
To not go far enough when trying to reach a goal.
(by extension) To underestimate.
noun
An undershot water wheel.
adjective
(of a water wheel) Powered by water flowing from below.
Having the lower incisor teeth projecting beyond the upper ones, as in the bulldog.