rub it in . keep talking about something that another person wants to forget反复讲别人不愿听的事

“I am really surprised that you failed exams．”“OK，don't rub it in！”“我没想到你会考试不及格。”“好啦，别再提啦！”

 rub off . remove with a rubber； erase擦掉

He rubbed off the finger mark from the painting．他擦去了画上的指印。

He rubbed off what he had written and started again．他把他所写的擦掉后又开始重写。

 rub off . appear or cause to appear less bright，remarkable or praiseworthy （使）减色

With the passing of time some of the glitter of the champion's success has rubbed off．随着时间的推移，这位冠军的成绩已不那么惊人了。

 rub off . stick to something touched（接触时）粘住

His dress touched the door that the worker was painting，and some paint rubbed off on it ．他的衣服碰到了工人正在油漆的那扇门，沾上了油漆。

Don't touch that charcoal；it will rub off．不要碰那煤炭，会弄脏你的手。

 rub off . pass to somebody  near as if by touching传给别人

We all hoped he would stay with us longer so that some of his good qualities might rub off on us．我们都希望他能和我们在一起多呆些日子，这样我们可以从他身上学到一些优秀品质。

Mr．Li is very lucky； I wish some of his luck would rub off on me．李先生运气真好，我希望他的运气能传些给我。

rub out . destroy completely；kill；eliminate毁灭；杀死；消除

The gangsters rubbed out four policemen before they were caught．匪徒们在被捕前打死了4名警察。

The city was rubbed out in the earthquake．这座城市在地震中毁灭了。

rub out . erase ； obliterate擦去；把…磨掉

The ink won't rub out．这种墨水擦不掉。

He rubbed out his name and wrote his father's name in its place．他擦去他自己的名字，写上了他父亲的名字。

rub shoulders .rub elbows . be in the same place（with others）；meet and mix 互相接触；在一起；与他人往来

We don't rub shoulders with such arrogant people．我们不和这种狂妄自大的人来往。

rub up . polish by rubbing 擦光；把…磨光滑

When you have put the polish on the silver，rub it up with a clean dry cloth．在银器上打上擦光剂后，要用块干净的干布把它擦亮。

He rubbed the vase up until it shone．他把花瓶擦得铮亮。

rub up . excite；rouse to action； revive or refresh one's knowledge of 激起；唤起；复习

Your French needs rubbing up．你的法语需要复习一下。

I cannot find a recipe which I cut from the paper ；I must rub up my memory and recall where I laid it ．我从报上剪下来的一张配方找不到了，我得好好想想放在哪里了。

rub up against .  rub against something in passing擦上；相磨擦

Look at the spot on your skirt！You must have rubbed up against wet paint somewhere看看你裙子上的脏斑！你一定是在什么地方碰上没干的油漆了。

rub up against . meet or come into contact with by accident 偶然相遇

You occasionally rub up against most interesting people in unlikely Places．有时在意想不到的地方会遇上很有趣的人。

rule out .  declare the impossibility of； exclude 排除；表示不可能；不把…考虑在内

We can not rule out the possibility that he'll come after all．我们不排除他最终会来的可能性。

Anyone who has entered for the same competition before is ruled out according to the regulations．凡以前参加过同样比赛的人，按照规则均不得参加。

The doctor took X-rays to rule out the chance of broken bones．医生拍了X光片，以排除骨折的可能性。

That idea can be completely ruled out．那种想法可以完全排除。

rule out . not allow ；decide against； prevent不允许；反对；阻止

The principal ruled out dances on week days．校长不允许在周末以外的时间跳舞。

A sudden storm ruled out the boat race．突然来的暴风雨使划船比赛无法进行了。

run across . find or meet by chance偶然发现；偶遇

I ran across the article in yesterday's newspaper．我在昨天的报纸上偶然发现了这篇文章。

He ran across an excellent book on the subject in the library．他在图书馆偶然找到了有关这个题目的一本极好的书。

I ran across my old classmate in the street yesterday．昨天我在街上偶然碰到了我的老同学。

run across . convey across让…搭车穿过；运送…到对面去

He ran us across to the other side of the bay in his private launch．他用私人汽艇送我们到海湾彼岸。

run across .  cross（by running）（跑着）穿过

Burning with curiosity，she ran across the fields after the dog．她充满了好奇心，跟在那条狗后面奔过田野。

run after .  chase追赶

The dog ran after a cat．那只狗追赶着一只猫。

Don't bother running after the bus；you'll never catch it ．别费劲去追赶那辆公共汽车了，你怎么也赶不上的。

run after . try to gain attention and company of（an opposite sex）追求（异 性）

He's always running after women．他总是追求女性。

He has been running after her for months，but she isn't interested in him at all．他追求她好几个月了，可她对他根本不感兴趣。

run after . serve；care for服务；关照

Don't expect me to run after you all your life！别指望我会伺候你一辈子！

She often runs after my child． 她常照料我的孩子。