English to English
1. 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
2. An involuntary act, excited by drowsiness, etc., consisting of a deep and long inspiration following several successive attempts at inspiration, the mouth, fauces, etc., being wide open.
3. utter a yawn, as from lack of oxygen or when one is tired
The child yawned during the long performance
4. be wide open
the deep gaping canyon
5. To open the mouth involuntarily through drowsiness, dullness, or fatigue; to gape; to oscitate.