1. Take an involuntary deep breath through a wide open mouth, as from being tired, sleepy or bored
   "The child yawned during the long performance"
    
2. Be wide open
   "the deep yawning canyon";
   - gape

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: yawning, yawns, yawned

Type of: breathe, inborn reflex, innate reflex, instinctive reflex, open, physiological reaction, reflex, reflex action, reflex response, respire, suspire [literary], take a breath, unconditioned reflex

Encyclopedia: Yawn