undergirded; undergirding; undergirds
Synonyms of undergird

transitive verb

1
archaic : to make secure underneath
… took measures to undergird the ship …—Acts 27:17 (Revised Standard Version)
2
: to form the basis or foundation of : strengthen, support
Facts and statistics subtly undergird his commentary …—Susan Q. Stranahan

Did you know?

When undergird was a new word in the 16th century, it was ships that were undergirded—that is, made secure below—and the undergirding was done by passing a rope or chain underneath. That literal sense has long since fallen out of use, but in the 19th century undergird picked up the figurative “strengthen” or “support” meaning that we still use. Centuries before anything was undergirded, however, people and things could be girded—that is, encircled or bound with a flexible band, such as a belt. Girding today is more often about preparing oneself to fight or to do something difficult, as in “girding themselves for an ideological battle.” About as old as gird is the word’s close relation, girdle, which originally referred to an article of clothing that circles the body usually at the waist; the girdles of today address the same anatomical territory but with the squeezy aim of making the waist look thinner. Gird also gives us girder, a noun referring to a horizontal piece supporting a structure.

Examples of undergird in a Sentence

the theory of evolution undergirds virtually all of modern biology
Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Ukrainians awoke on Wednesday to find that their military had been restricted in its use of Starshield, the American satellite service undergirding swaths of the nation’s defensive infrastructure and weaponry. — Timothy Nerozzi, The Washington Examiner, 15 Oct. 2026 However, crypto companies like Galaxy could see their shares rise as investors focus more on the infrastructure that undergirds stablecoins and other tokenized assets, per Citi. — Liz Napolitano, CNBC, 13 Oct. 2026 Gallego’s sweeping proposals certainly look like the policy engine undergirding a 2028 presidential campaign. — Burgess Everett, semafor.com, 7 Oct. 2026 The paradox is at the heart of the magical thinking undergirding our prison culture. — Doreen St. Félix, New Yorker, 3 Oct. 2026 See All Example Sentences for undergird

Word History

First Known Use

1526, in the meaning defined at sense 1

Time Traveler
The first known use of undergird was in 1526

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Cite this Entry

“Undergird.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/undergird. Accessed 20 Oct. 2026.

Kids Definition

: to make secure : brace up : strengthen
a life undergirded by religion
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