名词形式是breath，表示气息，呼吸的意思，例如：

1.I could smell alcohol on his breath.我闻得到他呼吸中有酒气。

2.She was very short of breath.她呼吸很困难。

3.The weather was hot, without a breath of wind.天气炎热，连一丝风都没有。

4.Take a deep breath and see how long you can stay underwater.深吸一口气，看你能在水里待多久。