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." "As when a cloud his beams doth overlay." "Framed of cedar overlaid with gold." "And overlay With this portentous bridge the dark abyss."
Specifically: To cover (an object made of an inexpensive metal, glass, or other material) with a thin sheet of an expensive metal, especially with silver or gold. Distinguished from to plate, which is done by a chemical or electrical deposition process.
To smother with a close covering, or by lying upon. "This woman's child died in the night; because she overlaid it." "A heap of ashes that o'erlays your fire."
(Printing) To put an overlay on.