yawn

Noun
  1. An involuntary intake of breath through a wide open mouth;
    Usually triggered by fatigue or boredom (synset 100838954)
    "he could not suppress a yawn"; "the yawning in the audience told him it was time to stop"; "he apologized for his oscitancy"
Verb
  1. Utter a yawn, as from lack of oxygen or when one is tired (synset 200007328)
    "The child yawned during the long performance"
  2. Be wide open (synset 202724625)
    "the deep gaping canyon"

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