Meaning

noun an involuntary intake of breath through a wide open mouth; usually triggered by fatigue or boredom

verb utter a yawn, as from lack of oxygen or when one is tired

verb be wide open

originPartly from Middle English yanen, yonen, yenen (“to yawn”), from Old English ġeonian, ġinian (“to yawn, gape”), from Proto-West Germanic *ginōn, from Proto-Germanic *ginōną (“to yawn”); and partly from Middle English gonen (“to gape, yawn”), from Old English gānian (“to yawn, gape”), from Proto-West Germanic *gainōn, from Proto-Germanic *gainōną (“to yawn, gape”); both from Proto-Indo-European…

Etymology from Wiktionary, CC BY-SA 3.0