1.

Hold your horses

解释

Stop and wait for a minute; be reasonable.

冷静下来；多一些理智。

例句

Don’t get so angry, John. Just hold your horses and I will see what I can do for you.

别那么生气，约翰。沉住气，我看看能为你做些什么。

2.

Get on one’s high horse

解释

Be self-important; show off.

自以为是；自命不凡。

例句

When the postgraduate visited his hometown in the remote province, he got on his high horse among the local people.

那个研究生到偏远省份的家乡考察时，目空一切，趾高气扬。

3.

Look a gift horse in the mouth

解释

Be not content with something received as a gift.

瞧不起别人送的礼物，觉得不满意。

说明

看一匹马的牙齿可得知那匹马的年龄，养马的人都知道这一点。送你一匹马，你不要抱怨马有点老。常用于否定句。

例句

I think your birthday present is very nice, so don’t look a gift horse in the mouth!

我认为你的生日礼物很好，不要吹毛求疵啦！

5.

A horse of a different color

解释

 Another matter altogether.

完全是另一码事；另外一回事。

例句

Gambling is not the same as investing in the share market. It is a horse of a different color.

赌博和投资股票市场不一样，完全是另外一回事。