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yawn

intransitive verb

  1. to open the mouth wide, esp. involuntarily, and breathe in deeply, as a result of fatigue, drowsiness, or boredom
  2. to be or become wide open; gape: a yawning chasm

transitive verb

to express or utter with a yawn

noun

  1. an act of yawning or opening wide
  2. a wide opening; chasm

See yawn in American Heritage Dictionary 4

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