un·der·pin·ning /ˈʌndɚ/
  支撐,建築物下麵的基礎,支柱
  Un·der·pin v. t. [imp. & p. p. Underpinned p. pr. & vb. n. Underpinning.]
  1. To lay stones, masonry, etc., under, as the sills of a building, on which it is to rest.
  2. To support by some solid foundation; to place something underneath for support.
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  Un·der·pin·ning n.
  1. The act of one who underpins; the act of supporting by stones, masonry, or the like.
  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. [Local, U. S.]
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  underpin
       v 1: support from beneath
       2: support with evidence or authority or make more certain or
          confirm; "The stories and claims were born out by the
          evidence" [syn: corroborate, bear out, support]
       [also: underpinning, underpinned]