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underpinning

[uhn-der-pin-ing] /ˈʌn dərˌpɪn ɪŋ/
noun
1.
a system of supports beneath a wall or the like.
2.
Often, underpinnings. a foundation or basis:
to uncover the emotional underpinnings of an illness.
3.
underpinnings, Informal.
  1. underwear, especially women's underwear.
  2. the legs.
Origin
1480-1490
1480-90; under + pin + -ing1

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
1515-25; under- + pin
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for under-pinning

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

underpinning

/ˈʌndəˌpɪnɪŋ/
noun
1.
a structure of masonry, concrete, etc, placed beneath a wall to provide support
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for under-pinning

underpinning

n.

late 15c., "action of supporting or strengthening from beneath," from under + present participle of pin (v.). Figurative sense of "prop, support" is recorded from 1580s.

underpin

v.

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

Online Etymology Dictionary, © 2010 Douglas Harper
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