yawn

Noun

• 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
    

Verb

• be wide open
  • the deep gaping canyon
    

• utter a yawn, as from lack of oxygen or when one is tired
  • The child yawned during the long performance
    

Related words

• Synonyms: 
  yawning , oscitance , oscitancy , gape , yaw