When something underlies something else, it is the foundation or support of that something. The underlies of a tree are the roots that hold it up, the trunk that supports it, and the branches that grow from it.
The underlies of the building are the ground and the foundation.
The underlies of the argument are the issues that were raised.
verb
To lie in a position directly beneath.
verb
To lie under or beneath.
verb
To serve as a basis of; form the foundation of.
verb
To be subject to; be liable to answer, as a charge or challenge.
verb
To underlay.
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Is the underlying parameter the same as the underlying variable
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The underlying principle is the same.
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Dating is the interpretation of the underlying data.
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Fix the underlying cause of the issue.
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The prognosis varies with the underlying cause.
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The underlying cause of the condition is unknown.
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The underlying concept of the album is the moon.
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They also underlie the phenomena of tickling.
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But the underlying issue is the corrosive effect of misrepresentation.
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But what is the explanation underlying the buoyancy force