run down . （of watch or clock）slow down or stop（钟表）走慢或不走

The kitchen clock ran down because we forgot to wind it ．厨房里的钟停了，因为我们忘了上发条。

run down . speak ill of；criticize unkindly贬低；不客气地批评

She is jealous of your success；that's why she's always running you down．她嫉妒你的成功，这就是她总是讲你坏话的原因。

He will flatter a person to his face， and then run him down behind his back．他会当面吹捧一个人，而在背后却造谣中伤。

That man doesn't like me ；he's always running me down．那人不喜欢我，他总是诽谤我。

run down . chase and catch 追捕

The police were able to run the jewel thieves down after a long search．警察经过长时间搜查，终于抓获了盗窃珠宝的小偷。

After hunting for him for over a week，the police ran the escaped prisoner down in a public house．在追捕了一个多星期后，警察终于在一家酒店里捉住了逃犯。

run down .  knock down and hurt撞伤

The poor boy has been run down by a bus．这个可怜的男孩子被汽车撞伤了。

She was afraid she would run someone down while driving．她害怕在开车时撞伤人。

run down . ill；in poor health or condition 体力衰弱；身体垮掉

Father caught a cold because he was run down from loss of sleep．父亲由于缺乏睡眠，体力衰弱而感冒了。

The old worker was run down after all those years of hard work．这位老工人因多年辛勤劳动而身体垮下来了。

His health ran down to a dangerous level．他的健康状况已恶化到危险的程度。

run down . find by hard and thorough search； trace the source of追根究底；探出…的根源

The policeman ran down proof that the burglar had robbed the store．警察追查小偷抢店铺的证据。

He had quite a time running down the technical words．他为查出这些术语的来源花了相当多的时间。

run down . （cause to） diminish in number，quantity，size，减少；缩小；降低

The coal industry is running down as coal deposits are used up．由于煤藏枯竭，煤炭工业正在衰落。

The farm labor force in this country is running down steadily．这个国家的农业劳动力正持续减少。

run down .  slowly bring to a halt使慢慢地停止

The management are running this factory down．管理部门正在慢慢使这个工厂停产。

run errands  . act as an errand boy；go to a store to buy things for somebody 跑腿；为别人办事；买东西

I have no time to run errands for you．我没时间替你跑腿。

Rufus runs errands for all the neighbours．鲁福斯为所有的邻居跑腿买东西。

run for . try to get elected； compete for an elected office竞选（公职）

Who will run for President next year ? 将竞选总统?  

He runs for mayor again．他再次竞选市长。

More people than ever before are running for the city council．这次参加市议会竞选的人比以往任何时候都多。

run for . hasten to fetch 匆匆去拿或去请

One of my classmates was seriously ill，so we ran for the doctor．我的一位同班同学病得厉害，我们急忙去请医生。

run in . （of a new car or one with a new engine） drive it slowly and carefully until the engine runs freely and easily（指新汽车或换上新引擎的 汽车）缓慢而谨慎地试开；试车

We had better allow plenty of time，as I can't drive fast ； the car isn't run in yet．我们最好把时间留宽裕些，我不能把车子开得很快，因为还没有试过车。

The workers are running in the new machines．工人们正在试开那些新机器。

run in . visit casually非正式地访问；顺便看望

Run in and see me this evening．今晚请到我家来坐坐。

She lived close by and was used to running in whenever she was free．她住在附近，一有空就过来看我们。

run in . convey in（usu．in a car）把…送到；送入（通常指用汽车）

I'll run you in to the station in a few minutes．我马上就用车送你到车站去。

run in . introduce引进

They ran the liquid through a tube．他们把液体通过试管引进来。

run into . meet by chance 偶然碰见；巧遇；碰上

I unexpectedly ran into him on the street yesterday evening．昨天晚上我在街上偶然碰见了他。

Their ship ran into a strong gale at sea．他们那条船在海上遇到了大风。

run into . collide with与…碰撞

Suddenly he lost control of his bike and ran into a lamppost．他突然控制不住自己的自行车，一下子撞到了电线杆上。

He ran into the back of a bus．他撞上了一辆公共汽车的尾部。

run into . be affected by ；get into；encounter遭遇到；陷入；经历

You will certainly run into many difficulties，but you must not give up．你一定会遇到很多困难，但不能放弃。

When I ran into a problem while making my model airplane， I asked my father for help．当我在做飞机模型遇到困难时，我请我父亲帮忙。

He has run into trouble in his job．他在工作中遇到了困难。

If you travel alone in that forest，you may run into danger．如果你独个儿在那片森林里行走，你会遇到危险的。

She has run heavily into debt．她负债累累。

run into . add up to；amount to；total总计为；累计达到

The new dictionary has run into several editions．那部新词典已经再版好几次了。

The number of people killed on the highways during holidays runs into hundreds．高速公路上伤亡人数在假期里高达数百人。

Losses ran into millions of dollars．损失达几百万美元。

run into . mix with；join with 与…混合 ；与…相会合

The rivers on the other side of the mountains run into the Atlantic．山另一侧的河流都流入了大西洋。

The small brook runs into a big river in the valley below．这条小溪在下边的山谷里流入一条大河。

run into . continue into延续到；接连；跟着

One year ran into the next，and still there was no change．年复一年，依然如故。