Yawn

yawn, v.i. to open the jaws involuntarily from drowsine : to gape: to gape with astonishment.— n. the opening of the mouth from drowsine .— adj. Yawn′ing , gaping: opening wide: drowsy.— n. act of opening wide or gaping: a modification of the ordinary movements of respiration, in which the inspiration is deeper than usual, accompanied by a kind of spasmodic contraction of the muscles which depre the lower jaw, and by a great elevation of the ribs and to some degree of the shoulder-blades.— adv. Yawn′ingly . [A.S. gánian , to yawn— gínan , pa.t. gán , to gape widely; Ice. gína , to gape, Gr. chaine in , to gape.]