n.

1. 呵欠[C]
   He stretched himself with a yawn.

   他打了個呵欠伸了伸懶腰。

2. 裂口，豁口；凹口[C]
3. 【口】乏味的人（或事）[S]
   The play was a big yawn from start to finish.

   那齣戲從頭至尾極其乏味。

vi.

1. 打呵欠
   Mr. Walsh yawned over the evening papers.

   華爾希先生一邊看晚報一邊打呵欠。

2. 裂開，豁開
   A big gap yawned between the rocks.

   岩石間豁開一個大裂口。

vt.

1. 打著呵欠說
   The old man yawned a reply.

   那老人打著呵欠作答。

v.

1. involuntarily open one's mouth wide and inhale deeply due to tiredness or boredom.
2. [usu. as adj. yawning] be wide open:
   a yawning chasm.

n.

1. an act of yawning.
2. informal a boring or tedious thing or event.