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undergird

verb
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Synonyms of undergird

to hold up or serve as a foundation for
  • the theory of evolution undergirds virtually all of modern biology

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The first known use of undergird was in 1526

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“Undergird.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/undergird. Accessed 27 Nov. 2020.

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