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2 definitions found
 for underpin
From The Collaborative International Dictionary of English v.0.48 :

  Underpin \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.
        [1913 Webster]
     2. To support by some solid foundation; to place something
        underneath for support.
        [1913 Webster]

From WordNet (r) 3.0 (2006) :

      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, underpin, bear out,

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