资料来源 : WordNet®

oscitance
     n 1: drowsiness and dullness manifested by yawning [syn: {oscitancy}]
     2: an involuntary intake of breath through a wide open mouth;
        usually triggered by fatigue or boredom; "he could not
        suppress a yawn"; "the yawning in the audience told him it
        was time to stop"; "he apologized for his ostinancy" [syn:
         {yawn}, {yawning}, {oscitancy}]