1. To lay, or spread, something over or across; hence, to cover; to overwhelm; to press excessively upon. When any country is overlaid by the multitude which live upon it. (Sir W. Raleigh) As when a cloud his beams doth overlay. (Spenser) Framed of cedar overlaid with gold. (milton) And overlay With this portentous bridge the dark abyss. (Milton)
3. To put an overlay on.
Origin: Overlaid; Overlaying.