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"
例句
用作名词(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.研究人员发现，在看别人打呵欠的视频时，用鼻子呼吸的人比用口腔呼吸的人打呵欠的几率要小。
用作形容词(adj.)
Although we associate yawning with sleepiness and boredom, its function appears to be to wake us up.虽然我们把打哈欠与睡意和厌倦联系在一起，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.如果在咖啡杯上画上一张正在打哈欠的嘴，当你喝咖啡准备醒醒脑子的时候，别人看到你的杯子却会增加困意。
