prep.反對(duì)；逆；違背；倚靠；映襯；防御；相比；相對(duì)

There are 26 votes for him and 8 against him. 有26票贊成他，8票反對(duì)他。

We sailed against the wind. 我們逆風(fēng)航行。

It's against your promise to go on smoking. 繼續(xù)抽煙,這違背了你的諾言。

They forced me to do things against my will. 他們強(qiáng)迫我做違背我心意的事。

He propped himself against the wall. 他倚靠著墻。

We have saved some money against our old age. 我們存了一些錢，以備老年之用。

Our defences must be reinforced against attack. 我們必須加強(qiáng)防御設(shè)施以抵御進(jìn)攻。

His eloquence did not avail against the facts. 他的雄辯在事實(shí)面前不起什么作用。

You must weigh the benefits against the cost. 你一定要權(quán)衡利益與成本二者的得失。

against用在fight，strive，struggle等詞后面，同with意思相同，不過(guò)against更強(qiáng)調(diào)一種困難中的反抗。 We fight for the weak against the strong.

作為介詞，against后接的賓語(yǔ)有時(shí)可省略。 He had intended to come but somehow decided against(it).

against作“反對(duì)”解時(shí)反義詞是for。