Meaning

noun an outward bevel around a door or window that makes it seem larger

verb spread open or apart

verb turn outward

originPIE word *dwís The verb is derived from Middle English splaien, splayen (“to display; to spread out, unfurl (a flag, etc.); (cooking) to cut open (a fish) lengthwise and lay it open; (figurative) to appear; to spread”), an aphetic form of Middle English displaien, displayen (“to display”): see display. The adjective and adverb are derived from the verb, or from splayfoot (noun) or splayfooted…

Etymology from Wiktionary, CC BY-SA 3.0