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Meaning of underpin

un•der•pin

Pronunciation: (un"dur-pin'), [key]
— -pinned, -pin•ning.
  1. to prop up or support from below; strengthen, as by reinforcing a foundation.
  2. to replace or strengthen the foundation of (a building or the like).
  3. to furnish a foundation for; corroborate: The author's conclusions are underpinned by references to experimental findings.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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