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underpin

[uhn-der-pin] /ˌʌn dərˈpɪn/
verb (used with object), underpinned, underpinning.
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.
Origin of underpin
1515-1525
1515-25; under- + pin
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for underpin

underpin

/ˌʌndəˈpɪn/
verb (transitive) -pins, -pinning, -pinned
1.
to support from beneath, esp by a prop, while avoiding damaging or weakening the superstructure: to underpin a wall
2.
to give corroboration, strength, or support to
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for underpin
v.

1520s (figurative); 1530s (literal), from under + pin (v.). Related: Underpinned; underpinning.

Online Etymology Dictionary, © 2010 Douglas Harper
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