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underpin

[ uhn-der-pin ]
/ ˌʌn dərˈpɪn /
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See synonyms for: underpin / underpinned / underpinning on Thesaurus.com

verb (used with object), un·der·pinned, un·der·pin·ning.

to prop up or support from below; strengthen, as by reinforcing a foundation.
to replace or strengthen the foundation of (a building or the like).
to furnish a foundation for; corroborate: The author's conclusions are underpinned by references to experimental findings.

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The rainy weather could not ________ my elated spirits on my graduation day.

Origin of underpin

First recorded in 1515–25; under- + pin
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

British Dictionary definitions for underpin

underpin
/ (ˌʌndəˈpɪn) /

verb -pins, -pinning or -pinned (tr)

to support from beneath, esp by a prop, while avoiding damaging or weakening the superstructureto underpin a wall
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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