Definitions from Wiktionary (overlay)

▸ verb:  (transitive) To lay, spread, or apply (something) over or across (something else); to overspread.
▸ verb:  To overwhelm; to press excessively upon.
▸ verb:  (transitive, now rare, archaic) To lie over (someone, especially a child) in order to smother it; to suffocate.
▸ verb:  (transitive, printing) To put an overlay on.
▸ verb:  (transitive, gambling) To bet too much money on.
▸ noun:  (photography, graphic arts) An image to be overlaid on another; a superimposition or diapositive.
▸ noun:  (printing) A piece of paper pasted upon the tympan sheet to improve the impression by making it stronger at a particular place.
▸ noun:  (gambling) Odds which are set higher than expected or warranted. Favorable odds.
▸ noun:  (horse racing) A horse going off at higher odds than it appears to warrant, based on its past performances.
▸ noun:  A decal attached to a computer keyboard to relabel the keys.
▸ noun:  (programming) A block of program code that is loaded over something previously loaded, so as to replace the functionality.
▸ noun:  (Internet) A pop-up covering an existing part of the display.
▸ noun:  (Scotland) A cravat.
▸ noun:  A covering over something else.

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