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1. Utter a yawn, as from lack of oxygen or when one is tired
   "The child yawned during the long performance"
    
2. Be wide open
   - gape, yaw

1. An involuntary intake of breath through a wide open mouth; usually triggered by fatigue or boredom
   "he could not suppress a yawn"
   - yawning, oscitance, oscitancy, oscitation

Derived forms: yawned, yawns, yawning

See also: yawner

Type of: be, breathe, inborn reflex, innate reflex, instinctive reflex, physiological reaction, reflex, reflex action, reflex response, respire, suspire, take a breath, unconditioned reflex

Encyclopedia: Yawn