yawn

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yawn

(yawn),
1. To gape.
2. An involuntary opening of the mouth, usually accompanied by inspiration; it may be a sign of drowsiness or of vital depression, as after hemorrhage, but is often caused by suggestion.
[A.S. gānian]

yawn

(yôn)
v. yawned, yawning, yawns
v.intr.
To open the mouth wide with a deep inhalation, usually involuntarily from drowsiness, fatigue, or boredom.
n.
The act of yawning.

yawn′er n.

yawn

[yôn]
Etymology: AS, geonian
an involuntary act of opening the mouth wide and taking a deep breath. It tends to occur when a person is bored, drowsy, or depressed and may be accompanied by upper body movements or the act of stretching to aid chest expansion.

yawn

The involuntary opening of mouth to inhale/exhale O2/CO2; thought to be a response to the slowed breathing typical of boredom, exhaustion or sedentary inactivity—which are characterised by increased CO2 and reduced O2 in the circulation—by opening the mouth wide and inhaling deeply, yawns quickly intake O2 and expel CO2 to bring the gases back to normal levels.

yawn

 The involuntary opening of mouth, often caused by suggestion–“contagious” and accompanied by breathing inward then outward; repeated yawning may indicate drowsiness, depression, or boredom

yawn

(yawn)
1. To gape.
2. An involuntary opening of the mouth, usually accompanied by a movement of respiration; it may be a sign of drowsiness or of vital depression, as after hemorrhage, but is often caused by suggestion.
[A.S. gānian]

yawn

(yawn)
1. To gape.
2. An involuntary opening of the mouth, usually accompanied by inspiration; it may be a sign of drowsiness or of vital depression, as after hemorrhage, but is often caused by suggestion.
[A.S. gānian]