Definition of yawn:

part of speech: verb

To open the mouth wide in voluntarily or unitentionally, through sleepiness; to gape in amazement; to open wide; as, the chasm yawned beneath him.

part of speech: noun

The opening of the mouth from drowsiness.

part of speech: noun

An involuntary or unintentional opening of the jaws, due to sleepiness; gape.

part of speech: verb

To open the jaws involuntarily from drowsiness: to gape.

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