UNDERPINNING

underpinning. Underpinning, n. foundation wall, prop

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Un″der‐pin′ning (?), n. 1. 1. The act of one who underpins; the act of supporting by stones, masonry, or the like.
2. 2. (Arch.) (a) That by which a building is underpinned; the material and construction used for support, introduced beneath a wall already constructed. (b) The foundation, esp. of a frame house.