一、详细释义：

n.

老鼠，耗子

例句：

If you do not feed the cat, you must feed the rat.

不养猫必养鼠。

例句：

You look like a little drowned rat!

看你就像只小溺水鼠！

鼠辈，卑鄙小人

例句：

You dirty rat !

你这个卑鄙的小人！

例句：

Even if you win , you're still a rat.

就算你赢了，你也只不过是个小人。

v.

捕鼠 [I]

例句：

The little boy likes to rat.

这个小男孩喜欢捕鼠。

例句：

Have you ever heard about dogs going ratting?

你听说过狗拿耗子吗？

弄蓬松 [T]

例句：

She ratted her hair whenever she went to big parties in the evening.

她每次晚上出去参加大型晚会时都用发垫把头发垫得高高隆起。

告密，出卖 [I]

例句：

To our surprise they have ratted on us.

令我们吃惊的是他们居然把我们出卖了。

例句：

They were accused of encouraging children to rat on their parents.

他们被指控唆使儿童告发自己的父母。

违约，食言 [I]

例句：

She claims he ratted on their divorce settlement.

她声称他违反了他们的离婚协议。

例句：

We should not rat on our promises.

我们不应违背诺言。

二、词义辨析：

mouse,rat

这两个名词均可表示“老鼠，耗子”之意。mouse一般指体形较小的家鼠。rat一般指生活在室外体形较大的一种老鼠。

三、相关短语：

rat race

n.卑鄙的竞争,你死我活的竞争 [电] 环形波导

rat snake

n. 吃鼠的蛇

cotton rat

棉鼠

pocket rat

囊鼠类

rat kangaroo

鼠袋鼠

rat typhus

地方性斑疹伤寒

rat-tail file

鼠尾锉

sewer rat

n. 褐家鼠

water rat

n. [动]河鼠

black rat

【医】 黑鼠

brown rat

【医】 棕鼠, 褐鼠, 沟鼠

wood rat

【医】 森林鼠

四、参考例句：

You dirty rat !

你这个卑鄙的小人！

A rat is an animal.

老鼠是一种动物。

You look like a little drowned rat!

看你就像只小溺水鼠！

We should not rat on our promises.

我们不应违背诺言。

I smelled a rat in the matter.

我感到这件事有问题。

Yes, only a rat puppet beat them out.

没错，只有一个老鼠木偶打败过他们。

A rat had gnawed a hole in the box.

老鼠在箱子上咬了一个洞。

The cat caught a big rat in the kitchen.

猫在厨房捉到了一只大老鼠。

The hungry rat ravened down the poison bait.

饥饿的老鼠一口吞下毒饵。

It is really a great shame to rat out.

临阵脱逃真可耻。