1 [I] to let out a long, deep breath that shows you are tired, sad, disappointed, etc （因疲劳、悲伤、失望等）叹息，叹气: She sighed with disappointment at the news. 听到这消息，她失望地叹了口气。

2 [T] to say sth with a sigh 叹息着说: ‘I'm so tired,’ he sighed. 他叹息着说：“我累极了。”

3 [I] to make a long sound like a sigh 发出叹息般的声音 ➔sigh noun [C]