yawn >> jɔːn
Definition: [verb] involuntarily open one's mouth wide and inhale deeply due to tiredness or boredom.
Example: he began yawning and looking at his watch
Definition: [verb] (of an opening or space) be very large and wide.
Example: she started inching back from the abyss that yawned before her
Definition: [noun] a reflex act of opening one's mouth wide and inhaling deeply due to tiredness or boredom.
Example: he stretches and stifles a yawn