underpins

underpin

[uhn-der-pin]
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

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World English Dictionary
underpin (ˌʌndəˈpɪn)
 
vb , -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

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