prep. 反对；对…不利；紧靠；以防
against的词性只有一种，用法一般有以下三种常见用法：
1. 注意以下两个基本用法，许多其他用法和搭配均可从这两种基础引申出来：
(1) 表示“反对”“对着”“违反”“不利于”等。如：
We are all against his idea. 我们都反对他的想法。
He was married against his will. 他结婚是有违本意的。
He spoke against the new law. 他发言抨击新法律。
There were 20 votes for him and 12 against him. 有20票赞成他，12票反对他。
(2) 表示“靠着”“顶着”“迎着”“衬着”等。如：
He stood with his back against the door. 他背靠门站着。
He hit his head against the window. 他的头撞到了窗户上。
It is difficult to see anything against this bright light. 对着这种强光很难看到任何东西。
Bright red flags flow in the wind against the blue sky. 鲜艳的红旗映着蓝天迎风飘扬。
2. 注意 against 是介词，不是动词。如：
他靠在树上。
正：He leaned against the tree.
误：He against the tree.
这个计划你是赞成还是反对呢?
正：Are you for or against the plan?
误：Do you support or against the plan?
3. 正因为against是介词，所以后接动词时要用动名词。如：
我反对在警察到达之前采取任何行动。
正：I’m against doing anything till the police arrive.
误：I’m against to do anything till the police arrive.
1. He spent 25 years campaigning against racist and unjust immigration laws.
他用了25年的时间与带有种族歧视色彩和没有公正可言的移民法作斗争。
2. "One thing you can never insure against is corruption among your staff."—"Agreed."
“永远也防不胜防的就是员工内部的贪污腐败。”——“同意。”
3. He slewed the car against the side of the building.
他的车滑到了大楼的一侧，抵住了。
4. They were going to sail around the little island, against the tide.
他们打算绕着小岛逆潮航行。
5. This is something of a grudge match against a long-term enemy.
这可以说是一场与宿敌你死我活的比赛。
6. Owen was against it, on the grounds of expense.
欧文因费用问题对此表示反对。