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The Collaborative International Dictionary of English v.0.48 (gcide)

Underlay \Un"der*lay`\, n.
1. (Mining) The inclination of a vein, fault, or lode from
the vertical; a hade; -- called also {underlie}.
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2. (Print.) A thickness of paper, pasteboard, or the like,
placed under a cut, or stereotype plate, or under type, in
the form, to bring it, or any part of it, to the proper
height; also, something placed back of a part of the
tympan, so as to secure the right impression.
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Underlie \Un`der*lie"\, v. i.
To lie below or under.
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Underlie \Un"der*lie`\, n.
See {Underlay}, n., 1.
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Underlie \Un`der*lie"\, v. t. [AS. underlicgan. See {Under}, and
{Lie} to be prostrate.]
1. To lie under; to rest beneath; to be situated under; as, a
stratum of clay underlies the surface gravel.
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2. To be at the basis of; to form the foundation of; to
support; as, a doctrine underlying a theory.
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3. To be subject or amenable to. [R.]
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The knight of Ivanhoe . . . underlies the challenge
of Brian der Bois Guilbert. --Sir W.
Scott.
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