n.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"

同義詞：yawningoscitanceoscitancy

v.

utter a yawn, as from lack of oxygen or when one is tired

"The child yawned during the long performance"

be wide open

同義詞：gapeyaw

1. She yawns every time the lecture gets boring.
   每當講座變得無聊時，她就打哈欠。
2. The cat yawns lazily as it stretches on the windowsill.
   貓懶洋洋地伸展身體，打了個哈欠。