yawn

1. V-I If you yawn, you open your mouth very wide and breathe in more air than usual, often when you are tired or when you are not interested in something. 打哈欠

She yawned, and stretched lazily. 她打了個哈欠，伸了個嬾腰。

2. N-COUNT Yawn is also a noun. 哈欠

Rosanna stifled a huge yawn. 羅莎娜忍住了一個大哈欠。