to open the mouth involuntarily through drowsiness, dullness, or fatigue; to gape; to oscitate.-to open wide; to gape, as if to allow the entrance or exit of anything.-to open the mouth, or to gape, through surprise or bewilderment.-to be eager; to desire to swallow anything; to express desire by yawning; as, to yawn for fat livings.-an involuntary act, excited by drowsiness, etc., consisting of a deep and long inspiration following several successive attempts at inspiration, the mouth, fauces, etc., being wide open.-the act of opening wide, or of gaping.-a chasm, mouth, or passageway.