To open the mouth widely and take a long, deep breath because of tiredness or boredom.
be wide open
an involuntary intake of breath through a wide open mouth
utter a yawn; as from lack of oxygne or when one is tired
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 ostinancy"
utter a yawn, as from lack of oxygen or when one is tired; "The child yawned during the long performance"
be wide open; "the deep gaping canyon"
an involuntary intake of breath through a wide open mouth; usually triggered by fatigue or boredom
utter a yawn, as from lack of oxygen or when one is tired
