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 oscitancy" 同义词：yawn, yawning, oscitance,
drowsiness and dullness manifested by yawning 同义词：oscitance,
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