Definition - overlay

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overlay
  1. a layer of decorative material (such as gold leaf or wood veneer) applied over a surface
  2. kill by lying on; "The sow overlay her piglets"
  3. protective covering consisting, for example, of a layer of boards applied to the studs and joists of a building to strengthen it and serve as a foundation for a weatherproof exterior
  4. put something on top of something else; "cover the meat with a lot of gravy"
  5. kill by lying on; "The sow overlay her piglets"
  6. lie upon; lie on top of; "the granite overlies the older rocks"