cover up . cover completely；protect with clothing，etc．盖严；用衣服等把…裹起来

He covered the child up with a blanket．他用一条毯子把孩子盖严。

It's very cold outside and you should cover up warmly．外面很冷，你要穿暖和些。

cover up . hide something wrong or bad 掩盖；掩饰

Lies cannot cover up facts．谎言掩盖不了事实。

No pretty words can cover up its aggressive acts．漂亮的言辞掩盖不了它的侵略行径。

cram up . prepare oneself for an exam by hasty learning 临时抱佛脚

Some students like to cram up history to get good marks．有些学生喜欢临时抱佛脚背历史来得到好分数。

crave for . have a strong desire for 渴望

The oppressed crave for freedom and happiness．被压迫者渴望自由和幸福。

He claimed to be a democrat，but secretly he craved for absolute authority．他自称是民主主义者，但暗中却渴望得到绝对的权力。

crave for . ask forcefully for 恳求

Kneeling before the king，the prisoner craved for mercy．罪犯跪在国王面前，请求宽恕。

crazy about . very fond of or interested in 非常喜欢；对…入迷

He was crazy about his son．他非常喜欢儿子。

She is crazy about modern music．她对现代音乐入了迷。

crop up . arise；happen unexpectedly；be mentioned 被提到；突然出现

Some difficult questions cropped up at this point．这时出现了一些难题。

The committee may be recalled before the appointed date if any urgent business crops up．如果出现紧急事宜，委员会可以在预定的日期之前召开会议。

The subject cropped up in the course of conversation．谈话时无意中说到了这个题目。

His name kept cropping up in the newspaper．报上不断提到他的名字。

cross off . cross out . 删除

She crossed the phrase out and wrote in another．她把那个词组删掉，另写了一个。

The teacher crossed out several words in my composition．老师划掉了我作文里的几个词。

They crossed off his name from the list．他们把他的名字从名单上划掉了。

crowded with . full of；filled with 充满；拥挤

The shop is crowded with customers．商店里顾客盈门。

crush down . destroy completely by using force；suppress forcibly 镇压（下去）；压倒

The cruel king crushed down any sign of opposition from the people．残酷的国王对人民的任何反抗行为都加以镇压。

The more the reactionaries tried to crush down mass movements，the more determined the people became．反动派越是镇压群众运动，人民就变得越坚定。

It is likely that she will be crushed down by the bad news．很可能她会被这可悲的消息压垮。

crush up . reduce to powder；squeeze up into a ball 把…弄成粉末

The nurse crushed up the table to give it to the baby．护士把药片碾碎后喂婴儿吃。

After reading the letter，the man crushed it up and threw it into a dustbin．读完信后，那人把它捏成一团扔到垃圾箱中去了。

cry down . silence somebody by shouting 大声喊以使…静下来

Before he was halfway through his speech，the crowd cried him down．他才讲到一半，公众就把他哄下了台。

cry down .depreciate 贬低

The critic cried down the book．那位评论家贬低那本书。

He cried down everyone except the rich and the powerful．除了有钱有势的人，他什么人都瞧不起。

cry for . express a desire for by weeping or shouting 哭着要；嚷着

The child is crying for some more sweets．那孩子哭着要再吃一些糖果。

The strikers cried for a raise of pay．罢工者叫喊着要求增加工资。

cry for . need very much；be in pressing need of 急需；要求

The crops are crying for rain．庄稼急需雨水。

The housing problem in this city cried for immediate solution．该城市的住房问题急待解决。

cry off . call off；withdraw from（an agreement or undertaking）取消；撤回（协议或任务）

I had intended to go but I cried off at the last minute．我本来要去的，但是最后一分钟打消了这个念头。

He cried off this research project and left his friends in great difficulty．他撒手不管这个研究项目，使他的朋友们陷入困境。

John was going to help us，but he cried off．约翰本来要帮助我们的，但是他没有履行诺言。

cry out . shout loudly 大声喊叫

When the boys and girls saw so many yellow handkerchiefs，they cried out with delight．当男孩女孩看见这么多黄手帕时，他们高兴地喊了起来。

The wounded soldier cried out in pain．伤兵痛苦地喊叫着。

cry out . be in great need 急需（后接动词不定式）

The car is crying out to be repaired．这部车子急待维修。

The business is just crying out for some capital．这笔生意正急需本钱。

cry out against . complain loudly；protest strongly大声抱怨；强烈抗议

The workers are crying out against their being maltreated by the factory owner．工人们强烈抗议工厂的老板对他们的虐待。

Many people are crying out against the new rule．许多人正在强烈抗议这项新的规则。

The people are crying out against this injustice．人民正在大声疾呼反对这不公正的行为。