Etymology
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underlay (v.)

Old English under lecgan "to support by placing something beneath;" see under + lay (v.). Related: Underlaid; underlaying. Compare similarly formed Old High German Related: untarleccan, German unterlegen.

updated on February 26, 2014

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Definitions of underlay from WordNet
1
underlay (v.)
raise or support (the level of printing) by inserting a piece of paper or cardboard under the type;
underlay the plate
underlay (v.)
put (something) under or beneath;
They underlaid the shingles with roofing paper
underlay (v.)
provide with a base, support, lining, or backing;
underlay the boards with joists
2
underlay (n.)
a pad placed under a carpet;
Synonyms: carpet pad / rug pad / underlayment
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.