(USED WITHOUT OBJECT)
to open the mouth somewhat involuntarily with a prolonged, deep inhalation and sighing or heavy exhalation, as from drowsiness or boredom.
to open wide like a mouth.
to extend or stretch wide, as an open and deep space.
(USED WITH OBJECT)
Archaic. to open wide, or lay open, as if by yawning.
yawn | Define yawn at Dictionary.com
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A yawn is a reflex consisting of the simultaneous inhalation of air and the
stretching of the eardrums, followed by an exhalation of breath. Yawning (
Sep 23, 2011 ... People yawn more easily in cooler temperatures, supporting the idea that
yawning cools the brain.
Aug 19, 2014 ... Scientists working to unravel the mystery surrounding the yawn, and why it's
contagious, have discovered that yawning is much more ...
Jun 10, 2013 ... We all do it, and we all know it has at least something to do with how tired we feel
. But unlike sleep apnea or laptops in the bedroom, yawning is ...
Next time you're in a meeting, try this little experiment: Take a big yawn, cover
your mouth out of courtesy and watch to see how many people follow suit.
Everybody yawns — from unborn babies to the oldest great-grandparent.
Animals do it, too. But why, exactly, do people and animals yawn? No one knows
May 12, 2014 ... A new study has suggested that the reason we yawn has nothing to do with
tiredness or boredom, but actually works in order to cool down our ...
Jun 28, 2013 ... Pinpointing exactly why we yawn is a tough task, but the latest research suggests
that our sleepy sighs help to regulate the temperature of our ...