underlie
Americanverb (used with object)
-
underlies,
present (3rd person singular)
-
underlay,
past
-
underlain,
past participle
-
underlying
present participle
-
to lie under or beneath; be situated under.
-
to be at the basis of; form the foundation of.
-
Grammar. to function as the root morpheme or original or basic form of (a derived form).
The form “boy” underlies “boyish.”
-
Finance. to be primary to another right or security.
verb
-
to lie or be placed under or beneath
-
to be the foundation, cause, or basis of
careful planning underlies all our decisions
-
finance to take priority over (another claim, liability, mortgage, etc)
a first mortgage underlies a second
-
to be the root or stem from which (a word) is derived
"happy" underlies "happiest"
Other Word Forms
Derived Forms
Inflected Forms
Participles
Conjugated Forms
Present
-
underliesimple
-
underliessimple
-
have underlainperfect
-
has underlainperfect
-
am underlyingprogressive
-
are underlyingprogressive
-
is underlyingprogressive
-
have been underlyingperfect progressive
-
has been underlyingperfect progressive
Past
-
underlaysimple
-
had underlainperfect
-
was underlyingprogressive
-
were underlyingprogressive
-
had been underlyingperfect progressive
Future
Etymology
Origin of underlie
before 900; Middle English underlyen (v.), Old English underlicgan. See under-, lie 2
Explanation
While it’s true that when something underlies something else, it is beneath it, this does not necessarily mean subservience — it can also indicate a strong foundation or bedrock that underlies, or supports, an idea or decision. The Old English word underlicgan meant to serve or submit to another, and that meaning does carry through to the modern word underlie — to a point. Although still referring to something under something else, around 1850 the meaning of the verb shifted to include something that makes a foundation for something else. For example, one factor that underlies a patient's unusual symptoms might be his recent trip to a foreign country, where he could have picked up a local infection.
Vocabulary lists containing underlie
The Thing About Jellyfish
Looking to grow your vocabulary? Check out this interactive, curated word list from our team of English language specialists at Vocabulary.com – one of over 17,000 lists we've built to help learners worldwide!
"The Hand of Fatima" and "Old Ways, New World"
Interested in learning more words like this one? Our team at Vocabulary.com has got you covered! You can review flashcards, quiz yourself, practice spelling, and more – and it's all completely free to use!
Florida's B.E.S.T. Common Prefixes: under-
Want to remember this word for good? Start your learning journey today with our library of interactive, themed word lists built by the experts at Vocabulary.com – we'll help you make the most of your study time!
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
See Examples For:
“The paintings are about the smoldering tensions that underlie the American dream, so I think it’s a particularly apt moment to bring them back into the public eye.”
From Los Angeles Times ● Jun. 9, 2026
True open-source models allow full access to training data and code, while open-weight models share the numerical parameters, or “weights,” that underlie them.
From The Wall Street Journal ● Mar. 18, 2026
Talk to some folks in your family whom you trust to make sure you’re not overstepping any unspoken boundaries that underlie family relationships.
From MarketWatch ● Dec. 15, 2025
"By uncovering how these microscopic regulators cooperate," Tolić says, "we are not only deepening our understanding of biology but also moving closer to correcting the failures that underlie disease."
From Science Daily ● Dec. 10, 2025
For the first time, science could see the universal laws that underlie all of these little half laws.
From "Zero: The Biography of a Dangerous Idea" by Charles Seife
These help to dampen the chronic, low-grade inflammation that quietly underlies heart disease, diabetes and many cancers.
From Science Daily ● Aug. 10, 2026
This question underlies Naomi Kanakia’s snappily titled “What’s So Great About the Great Books?” a compelling if excessively cautious defense of classic literature.
From The Wall Street Journal ● Jul. 19, 2026
But five days after that, the DOJ notified the court in the Texas case that “the government has decided to maintain the definition” that underlies the ghost gun rule.
From Salon ● Jun. 2, 2026
By contrast, her father’s hypervigilance also underlies the narrative.
From Los Angeles Times ● May 11, 2026
This is the conception of life which underlies the Norse religion, as somber a conception as the mind of man has ever given birth to.
From "Mythology: Timeless Tales of Gods and Heroes" by Edith Hamilton
In postproduction, Del Toro sometimes underlay Elordi’s screams with his own guttural noises or the roars of lions and gorillas, imagining a voice created by mismatched lungs and a throat from different people.
From The Wall Street Journal ● Sep. 30, 2025
However, Sidony says her flooring was never inspected, and has shown the BBC her end of tenancy agreement which instructed her to remove carpets, underlay, gripper rods and laminate flooring.
From BBC ● Nov. 27, 2024
California created an orchard for the world in large part by tapping into prehistoric aquifers that underlay the Central Valley.
From Los Angeles Times ● Oct. 13, 2024
The turf was intended to function as an underlay for a plastic liner atop it as part of a construction project.
From Seattle Times ● Nov. 22, 2023
Over time, observation became an adjunct to experiment, both producing reliable facts in place of the unreliable, unspecific ‘experience’ which underlay so much classical and medieval discussion.
From "The Invention of Science" by David Wootton
A fundamental tension has always underlain the history of the Civil Rights movement, much as it did contemporaneous news coverage.
From The Wall Street Journal ● May 3, 2026
Approximately 91 per cent of these forests in the northern hemisphere are underlain by permafrost.
From Science Daily ● Nov. 9, 2023
The drill site in northwest Greenland was 138 miles from the coast and underlain by 4,560 feet of ice.
From Salon ● Jul. 23, 2023
The region is underlain by quartz veins, rich in ore.
From Seattle Times ● May 22, 2023
By far the larger portion of the surface of the continent is underlain by them.
From North America by Israel C. (Cook) Russell
In the orthodox view, this is rooted in economies’ underlying structure.
From The Wall Street Journal ● Aug. 28, 2026
Emery has coached Jackson before, knows the qualities he wants to develop and would be replacing a 30-year-old striker with a 25-year-old whose underlying numbers suggest there may still be considerable room to improve.
From BBC ● Aug. 28, 2026
More than a century later, the vocabulary has modernized, but the underlying idea has barely budged.
From Salon ● Aug. 28, 2026
Perpetual futures are derivative contracts without expiry allowing the holder to receive the economic return of the underlying asset.
From MarketWatch ● Aug. 28, 2026
First, the underlying loans were heavily concentrated in what Wall Street people were now calling the sand states: California, Florida, Nevada, and Arizona.
From "The Big Short" by Michael Lewis
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
