"yawn" in the noun sense
1. yawn, yawning, oscitance, oscitancy
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"
"yawn" in the verb sense
utter a yawn, as from lack of oxygen or when one is tired
"The child yawned during the long performance"
2. gape, yawn, yaw
be wide open
"the deep gaping canyon"
Source: WordNet® (An amazing lexical database of English)
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