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ADV
向后；往后；往回
If you move back, you move in the opposite direction to the one in which you are facing or in which you were moving before.
例句
The photographers drew back to let us view the body...
摄影师往后退开，好让我们查看尸体。
She stepped back from the door expectantly...
她满怀期待地从门口退了回来。
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ADV
回到原处
If you go back somewhere, you return to where you were before.
例句
I went back to bed...
我回到床上。
I'm due back in London by late afternoon...
我预计下午晚些时候回到伦敦。
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ADV
恢复原状；回到原来的状态
If someone or something is back in a particular state, they were in that state before and are now in it again.
例句
The rail company said it expected services to get slowly back to normal...
铁路公司表示，其运输服务将慢慢恢复正常。
Denise hopes to be back at work by the time her daughter is one...
丹尼丝希望等女儿满周岁就回去工作。
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ADV
归还；交还；放回；收回
If you give or put something back, you return it to the person who had it or to the place where it was before you took it. If you get or take something back, you then have it again after not having it for a while.
例句
She handed the knife back...
她递还刀子。
Put it back in the freezer...
把它放回冰箱。
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ADV
（将钟表）拨回
If you put a clock or watch back, you change the time shown on it so that it shows an earlier time, for example when the time changes to winter time or standard time.
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ADV
回应（来信、电话、目光等）
If you write or call back, you write to or telephone someone after they have written to or telephoned you. If you look back at someone, you look at them after they have started looking at you.
例句
They wrote back to me and they told me that I didn't have to do it...
他们回信告诉我说不必那么做。
If the phone rings say you'll call back after dinner...
如果有电话打来，就说你吃完饭再回电话。
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ADV
回到（某个话题）
You can say that you go or come back to a particular point in a conversation to show that you are mentioning or discussing it again.
例句
Can I come back to the question of policing once again?...
我能再回到维护治安的问题上来吗？
To come back to what I said in the Introduction, in the nineteenth century Spain was fully a part of Europe...
回到我在导言中所说的，19世纪的西班牙是欧洲整体的一部分。
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ADV
再次流行；再度成为潮流
If something is or comes back, it is fashionable again after it has been unfashionable for some time.
例句
Short skirts are back...
短裙又流行起来了。
Consensus politics could easily come back into fashion.
共识政治很可能再度兴起。
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ADV
在一段距离之外
If someone or something is kept or situated back from a place, they are at a distance away from it.
例句
Keep back from the edge of the platform...
请勿靠近站台边缘。
I'm a few miles back from the border...
我距离边境数英里。
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ADV
收拢；拢起；束起
If something is held or tied back, it is held or tied so that it does not hang loosely over something.
例句
Her hair was tied back...
她的头发扎了起来。
The curtains were held back by tassels.
窗帘用穗子拢了起来。
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ADV
（舒适地）向后仰
If you lie or sit back, you move your body backwards into a relaxed sloping or flat position, with your head and body resting on something.
例句
She lay back and stared at the ceiling...
她躺下盯着天花板。
She leaned back in her chair and smiled.
她靠在椅背上，微笑起来。
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ADV
回头，转身（看或喊）
If you look or shout back at someone or something, you turn to look or shout at them when they are behind you.
例句
Nick looked back over his shoulder and then stopped, frowning...
尼克回头看了看，又皱着眉头停了下来。
He called back to her.
他转身叫她。
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ADV
（表示描述场所的转换）在曾提到过的地方
You use back in expressions like back in London or back at the house when you are giving an account, to show that you are going to start talking about what happened or was happening in the place you mention.
例句
Meanwhile, back in London, Palace Pictures was collapsing...
与此同时，伦敦的皇宫影业公司也正在分崩离析。
Later, back at home, the telephone rang.
随后，家里的电话响了。
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ADV
以前；过去；追溯至
If you talk about something that happened back in the past or several years back, you are emphasizing that it happened quite a long time ago.
例句
The story starts back in 1950, when I was five...
故事可以追溯到1950年，那时我才5岁。
I was in St. Lucia back in January of this year...
今年1月份我在圣卢西亚。
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ADV
回想；回忆
If you think back to something that happened in the past, you remember it or try to remember it.
例句
I thought back to the time in 1975 when my son was desperately ill...
我回想起1975年我儿子病得奄奄一息的那段时间。
My mind flew back to stories I had heard about Vinnie.
我回想起曾听到过的关于文妮的那些传闻。
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PHRASE
来回；往返
If someone moves back and forth, they repeatedly move in one direction and then in the opposite direction.
例句
He paced back and forth...
他来回踱步。
Two boys were in the street, tossing a baseball back and forth.
两个男孩在街上来来回回地投接棒球。
Noun
1. the posterior part of a human (or animal) body from the neck to the end of the spine;
"his back was nicely tanned"2. the side that goes last or is not normally seen;
"he wrote the date on the back of the photograph"3. the part of something that is furthest from the normal viewer;
"he stood at the back of the stage""it was hidden in the rear of the store"4. (football) a person who plays in the backfield
5. the series of vertebrae forming the axis of the skeleton and protecting the spinal cord;
"the fall broke his back"6. the front and back covering of a book;
"the book had a leather binding"7. the part of a garment that covers your back;
"they pinned a `kick me' sign on his back"8. a support that you can lean against while sitting;
"the back of the dental chair was adjustable"9. the position of a player on a football team who is stationed behind the line of scrimmage
Verb
1. be behind; approve of;
"He plumped for the Labor Party""I backed Kennedy in 1960"2. travel backward;
"back into the driveway""The car backed up and hit the tree"3. give support or one's approval to;
"I'll second that motion""I can't back this plan""endorse a new project"4. cause to travel backward;
"back the car into the parking spot"5. support financial backing for;
"back this enterprise"6. be in back of;
"My garage backs their yard"7. place a bet on;
"Which horse are you backing?""I'm betting on the new horse"8. shift to a counterclockwise direction;
"the wind backed"9. establish as valid or genuine;
"Can you back up your claims?"10. strengthen by providing with a back or backing
Adjective
1. related to or located at the back;
"the back yard""the back entrance"2. located at or near the back of an animal;
"back (or hind) legs""the hinder part of a carcass"3. of an earlier date;
"back issues of the magazine"Adverb
1. in or to or toward a former location;
"she went back to her parents' house"2. at or to or toward the back or rear;
"he moved back""tripped when he stepped backward""she looked rearward out the window of the car"3. in or to or toward an original condition;
"he went back to sleep"4. in or to or toward a past time;
"set the clocks back an hour""never look back""lovers of the past looking fondly backward"5. in answer;
"he wrote back three days later""had little to say in reply to the questions"6. in repayment or retaliation;
"we paid back everything we had borrowed""he hit me and I hit him back""I was kept in after school for talking back to the teacher"