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To put (one thing) under another.
(verb-transitive)
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To provide with a base or support.
(verb-transitive)
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Printing To raise or support (the level of a bed) by inserting a piece of paper or other material under the type.
(verb-transitive)
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Something, such as felt under a carpet, that is underlaid. Also called underlayment.
(noun)
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Printing Paper or other material used to underlay.
(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.