1. A pad placed under a carpet
   "They installed a thick underlay to improve insulation and comfort";
   - carpet pad, rug pad, underlayment

1. Provide with a base, support, lining, or backing
   "underlay the boards with joists"
    
2. Put (something) under or beneath
   "They underlaid the shingles with roofing paper"
    
3. (printing) raise or support (the level of printing) by inserting a piece of paper or cardboard under the type
   "underlay the plate"

1. Be or form the base for
   "A strong foundation underlies the entire structure"
    
2. Lie underneath
   "A layer of bedrock underlies the entire region"

Derived forms: underlaid, underlays, underlaying

Type of: be, bring up, cater, elevate, exist, get up, lay, lie, lift, pad, place, pose, position, provide, put, put up, raise, set, supply

Encyclopedia: Underlay