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.
source: WordNet 3.0
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.
source: Webster 1913
verb
utter a yawn, as from lack of oxygen or when one is tired
The child yawned during the long performance.
source: WordNet 3.0
be wide open
The deep gaping canyon.
source: WordNet 3.0
To open the mouth involuntarily through drowsiness, dullness, or fatigue; to gape; to oscitate.
