vt to put an overlay on.
2. overlay ·noun a covering.
3. overlay ·impf of overlie.
4. overlay ·vt to smother with a close covering, or by lying upon.
5. overlay ·noun a piece of paper pasted upon the tympan sheet to improve the impression by making it stronger at a particular place.
6. overlay ·vt to lay, or spread, something over or across; hence, to cover; to overwhelm; to press excessively upon.