n.变节者；鼠；卑鄙的人

v.捕鼠；背叛；偷窃

He was regarded as a rat. 大家叫他变节者/叛徒。

The dog was worrying a rat. 那条狗撕咬著一只老鼠。

The dog nosed out a rat. 那只狗闻到了老鼠的气味。

Now I can see why people say he is such a rat. 现在我知道了为什么人们说他是卑鄙小人了。

But you promised to help us, you rat! 可是你答应过要帮我们的忙，你这言而无信的小人！

The little boy likes to rat. 这个小男孩喜欢捕鼠。

They said they'd help but they have rat on their friend. 他们说他们会帮忙的，但他们却背叛了朋友。

Why did he rat out on his friends? 他为什么背弃了朋友们呢?

We should not rat on our promises. 我们不应违背诺言。

rat用作名词时意思是“鼠”,转化为动词意为“捕鼠”,引申可表示“背叛”“告发”“食言”。

rat只用作不及物动词,在口语中常与介词on连用。

rat的过去式和过去分词均为ratted。