Underdig :: Underdig (v. t.) To dig under or beneath; to undermine.
Underditch :: Underditch (v. t.) To dig an underground ditches in, so as to drain the surface; to underdrain; as, to underditch a field or a farm..
Underdo :: Underdo (v. i.) To do less than is requisite or proper; -- opposed to overdo.
Underdo :: Underdo (v. t.) To do less thoroughly than is requisite; specifically, to cook insufficiently; as, to underdo the meat; -- opposed to overdo..
Underdoer :: Underdoer (n.) One who underdoes; a shirk.