underlie

verb

un·​der·​lie ˌən-dər-ˈlī How to pronounce underlie (audio)

transitive verb

1
: to lie or be situated under
2
: to be at the basis of : form the foundation of : support
ideas underlying the revolution
3
: to exist as a claim or security superior and prior to (another)
4
archaic : to be subject or amenable to

Examples of underlie in a Sentence

A tile floor underlies the rug. The river is underlain by limestone. We discussed the principles that underlay their methods. A theme of revenge underlies much of her writing.
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.
None had any significant underlying medical conditions. Brenda Goodman, CNN Money, 20 Aug. 2025 Their underlying emotional driver is financial security for themselves and their family. Mary Clements Evans, Forbes.com, 19 Aug. 2025 The guidance also supports vaccination for older children with underlying health conditions or at parental discretion. Dr. James Campbell, vice chair of the AAP's infectious diseases committee, acknowledged the potential for confusion but emphasized the need to prioritize pediatric health. Amanda Castro, MSNBC Newsweek, 19 Aug. 2025 Critically, more than half of children aged 6 months to 23 months who are hospitalized for COVID-19 have no underlying medical condition that puts them at high risk for severe infection. Beth Mole, ArsTechnica, 19 Aug. 2025 See All Example Sentences for underlie

Word History

First Known Use

before the 12th century, in the meaning defined at sense 4

Time Traveler
The first known use of underlie was before the 12th century

Browse Nearby Words

Cite this Entry

“Underlie.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/underlie. Accessed 24 Aug. 2025.

Kids Definition

underlie

verb
un·​der·​lie ˌən-dər-ˈlī How to pronounce underlie (audio)
underlay -ˈlā How to pronounce underlie (audio) ; underlain -ˈlān How to pronounce underlie (audio) ; underlying -ˈlī-iŋ How to pronounce underlie (audio)
1
: to lie or be located under
2
: to form the foundation of : support
ideas underlying the revolt

More from Merriam-Webster on underlie

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