Definition of overlay

• v. t. - To lay, or spread, something over or across; hence, to cover; to overwhelm; to press excessively upon.
• v. t. - To smother with a close covering, or by lying upon.
• v. t. - To put an overlay on.
• n. - A covering.
• n. - A piece of paper pasted upon the tympan sheet to improve the impression by making it stronger at a particular place.
• imp. - of Overlie