get behind . go or do something  too slowly 落后；迟缓

The post office got behind in delivering Christmas mail．邮局把圣诞邮件送晚了。

During my illness I got behind．in my school work，and now it is difficult to catch up．当我生病时，我的功课落后了，现在很难赶上。

get behind . support；help 支持；赞助

If we all get behind Mr． Chen， we can easily elect him to that office．如果我们都支持陈先生，我们就能很容易地让他当选那个职位。

All of us should get behind the resolutions adopted at the meeting．我们大家都应该支持会上通过的决议。

We got behind him to be our monitor．我们拥护他当班长。

get behind . explain；find out the reason for 解释；找出原因

The police are questioning many witnesses to try and get behind the bank robbery．警察正在询问许多目击者以设法查清那起银行抢劫案。

get behind . fall into arrears；be late in paying 拖欠（款项等）

If your payments of rent get be hind，you will be asked to leave．你若拖欠租金，就得让你搬走。

John got behind with the payment on his car and had to surrender it to the garage．约翰拖欠了汽车付款，只好把车子交回车库。

They often get behind the gas bill．他们常常拖欠煤气费。

get below . become less than（an amount）少（低）于

If the temperature gets below freezing point，we should take the plants indoors．假如气温降到零度以下，我们就得把这些花木移入室内。

get below . become worse than a standard达不到（标准）

Your work has been getting below its usual standard recently，so you must improve it ．你的工作近来没有达到通常标准，所以你必须加以改进。

get by . pass 通过

I moved aside to let him get by．我让到一旁让他过去。

A lorry blocked the pathway， so that we couldn't get by．一辆卡车把路堵了，我们过不去。

Please move to the right so he can get by．请向右移一下，以便让他过去。

get by . succeed by a very narrow margin；reach a standard that is acceptable but not very good 勉强及格；勉强通过或达到标准

I didn't do too well on the examination，but I think I'll get by．我考的不太好，但我想我会勉强及格。

Your work will get by，but try to improve it ．你的工作勉强达到标准，但要争取做得更好些。

get by .not to be caught and scolded or punished 躲过；避开

How can we get by that guard at the door?  我们怎样才能躲过门口的卫兵呢?

The boy got by without answering the teacher's question because a visitor came in．这位学生没有回答老师的问题，但因为有客来访，所以没有受到批评。

get by .make ends meet 勉强生存

She gets by on a remarkably small income．她靠着微薄的收入过活。

He once got by on hunting．他曾一度靠打猎勉强维持生活。

get by .be tolerable；be passable 受得了；过得去

This work will get by， but that's all．这活还能对付得过去，可也就如此了。

The business has fallen off，but we manage to get by somehow．生意萧条了，可我们还是设法勉强过下去。

get down . descend or bring down（使）下来

The stairs were so steep that it was difficult to get the furniture down．这楼梯太陡，家俱难以搬下楼去。

I bumped into Mr．Wang as I got down from the bus．我下公共汽车时，偶然遇到了王先生。

get down . kill or destroy by shooting（通过射击）击落

They got down two enemy planes．他们击落两架敌机。

The hunter got down a number of birds．猎手打落了一些鸟。

get down . record in writing 记录下来

Here is a telephone message I got down for you．这是我给你记下来的电话留言。

Get down every word she says．记下她讲的每句话。

The teacher asked，“Have you got all the sentences down? ”老师问：“你们把所有的句子都记下来了吗?

get down . become depressed 沮丧；垂头丧气

She soon gets down， but she just as soon recovers her cheerfulness．她容易灰心丧气，但恢复愉快的心情也很快。

get down . depress somebody or impair somebody 's health使沮丧；使苦闷或损害健康

The news certainly got him down．这条消息肯定使他沮丧。

This miserable weather really gets us down．这鬼天气实在令我们难受。

In the end， the long hours of work combined with domestic worries got him down．长时间的工作以及家事的烦恼终于使他的身体垮了下来。

Difficulties，never get him down．困难从来压不垮他。

It is not desirable to get down．You should draw lessons from the failure，keep up your spirits and do your work well．垂头丧气是不可取的，你应该从失败中吸取教训，振作精神，做好工作。

get down .  swallow 吞下去；咽下去

The medicine was so bitter that she could not get it down．这药太苦，她吞不下去。

get down . kneel 跪下

It would be better if you got down and begged for mercy．你最好跪下来求饶。

get down to . go to work without waiting or hesitating；resolutely apply oneself to 立即开始工作；致力于（工作、任务等）

The chair person started the meeting promptly at seven o'clock and the committee got right down to business．会议主持者七点钟准时宣布开会，委员会接着就开始了工作。

It is time you got down to some reading or the other students will leave you behind．现在你该开始学习了，否则其他同学就要把你甩到后面去了。

That task isn't as difficult as it， seems when you really get down to it ．这任务似乎很难，但当你真地做起来，并不是那么困难。