an involuntary intake of breath through a wide open mouth; usually triggered by fatigue or boredom;
"he could not suppress a yawn"
"the yawning in the audience told him it was time to stop"
"he apologized for his oscitancy"
Adjective:
gaping open as if threatening to engulf someone or something;
"the yawning mine shaft"
"a yawning abyss"
with the mouth wide open indicating boredom or sleepiness;
"a yawning congregation"
showing lack of attention or boredom;
"the yawning congregation"
yawning的用法和樣例：
例句
用作名詞 (n.)
Yawning is a sign that you are sleepy or tired. 打呵欠表示你困了或是累了。
The researchers found that those who breathed through the nose rather than the mouth were less likely to yawn when watching a video of other people yawning. 研究人員發現，在看別人打呵欠的視頻時，用鼻子呼吸的人比用口腔呼吸的人打呵欠的幾率要小。
用作形容詞 (adj.)
Although we associate yawning with sleepiness and boredom, its function appears to be to wake us up. 雖然我們把打哈欠與睡意和厭倦聯繫在一起，但打哈欠的作用似乎是使人清醒。
If you draw up on a coffee cup is yawning mouth, a cup of coffee ready when you wake up the brain when people see the cup but you will increase the hardship of Italy. 如果在咖啡杯上畫上一張正在打哈欠的嘴，當你喝咖啡準備醒醒腦子的時候，別人看到你的杯子卻會增加困意。
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