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UNDERLAY

Definition:

[noun] a pad placed under a carpet
Synonyms: carpet pad, rug pad, ment
[verb] raise or support (the level of printing) by inserting a piece of paper or cardboard under the type; "underlay the plate"
[verb] put (something) under or beneath; "They underlaid athe shingles with roofing paper"
[verb] provide with a base, support, lining, or backing; "underlay the boards with joists"