What is the meaning of overlay?

noun

• 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.
  • synonyms: sheathing, overlayer
• A layer of decorative material (such as gold leaf or wood veneer) applied over a surface.

verb

• Put something on top of something else.
  • usage: "cover the meat with a lot of gravy"
  • synonyms: cover
• Kill by lying on.
  • usage: "The sow overlay her piglets"
  • synonyms: overlie
• Lie upon; lie on top of.
  • usage: "the granite overlies the older rocks"
  • synonyms: overlie
• Kill by lying on.
  • usage: "The sow overlay her piglets"
  • synonyms: overlie