Underpinning :: Underpinning (n.) The act of one who underpins; the act of supporting by stones, masonry, or the like..
Underpinning :: Underpinning (n.) That by which a building is underpinned; the material and construction used for support, introduced beneath a wall already constructed..
Underpinning :: Underpinning (n.) The foundation, esp. of a frame house..
Underpitch :: Underpitch (v. t.) To fill underneath; to stuff.