a loud yawn
stop yawning
frequent yawns
A: Why are you yawning so much?
A：你为什么一直打哈欠？
B: I am just very sleepy after that long flight.
B：长途飞行后我只是觉得非常困。
1) 张大嘴打哈欠
2) 表现出困倦
3) 表示无聊
1. 打哈欠
2. 哈欠
verb
1. to open one's mouth wide and take a deep breath, often due to tiredness or boredom
Synonym: gape
noun
1. the act of opening the mouth wide and inhaling deeply