(1):
(p. pr. & vb. n.) of Underpin
(2):
(n.) That by which a building is underpinned; the material and construction used for support, introduced beneath a wall already constructed.
(3):
(n.) The act of one who underpins; the act of supporting by stones, masonry, or the like.
(4):
(n.) The foundation, esp. of a frame house.
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