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IELTS BNC: 548 COCA: 300

once

Word family
once1 /wʌns/ ●●● S1 W1 adverbadv  
1 ONCEon one occasion only 一次,一回
 I’ve only met her once.
我只见过她一面。
 Paul’s been to Wexford once before.
保罗曾去过韦克斯福德一次。
(just) the once British EnglishBrE spoken
 Mrs Peterson came in to see Ruth just the once.
彼德森太太仅仅来看过露丝一次。
2 once a week/once every three months etc REGULARone time every week etc, as a regular activity or event 每周一次/每三个月一次等
 Staff meetings take place once a week.
员工会议每周举行一次。
 They took separate holidays at least once every two years.
他们每两年至少有一次各自去度假。
3 PASTat some time in the past, but not now 曾经,以前
 Sonya and Ida had once been close friends.
索尼娅和艾达曾经是很要好的朋友。
 She and her husband had once owned a house like this.
她和她丈夫曾经也有过这样的房子。
once-great/proud etc
 It was sad to see the once-great man looking so frail.
看到曾经的伟人如此脆弱,真让人难过。
 the once-mighty steel industry
一度辉煌的钢铁工业
4 in the past, at a time that is not stated 过去,曾经
 I once ran 21 miles.
我曾经跑过21英里。
 Marx once described religion as the ‘opium of the people’.
马克思曾把宗教称为人民的鸦片
5 at once 
a) IMMEDIATELYimmediately or without delay 立刻,马上
 Now, go upstairs at once and clean your room!
现在立刻上楼去打扫你的房间!
 When I saw him I recognized him at once.
一看到他我就认出他了。
b) TIME/AT THE SAME TIMEtogether, at the same time 一起,同时
 I can’t do two things at once!
我不能同时做两件事!
 Don’t all talk at once.
不要同时发言。
Register
In everyday English, when people mean 'immediately', they usually say right away or, in British English, straight away rather than at once: 在日常英语中,人们表示立刻时一般说right awaystraight away(英国英语),而不说at once
I recognized him right away.
我立刻认出了他。
Examples from the Corpus
6 once more/once again AGAIN
a) again, after happening several times before 再次〔发生〕,又一次
 I looked at myself in the mirror once more.
我再看了一眼镜子里的自己。
 Once again she’s refusing to help.
她再一次拒绝帮助。
b) used to say that a situation changes back to its previous state 再次〔回到原来状态〕
 The crowds had all gone home and the street was quiet once more.
众人都回家去了,街上恢复了宁静。
c) formal used before you repeat something that you said before 再说一次,重复说一遍
 Once again, it must be stressed that the pilot was not to blame.
再说一遍,必须强调的是飞行员没有责任。
7 all at once 
Examples from the Corpus
8 (every) once in a while SOMETIMESsometimes, although not often 偶尔,有时,间或
Examples from the Corpus
9 never once/not once used to emphasize that something has never happened 从未,从来没有
10 (just) for once RARELYused to say that something unusual happens, especially when you wish it would happen more often 难得一次,就这一回
Examples from the Corpus
11 once and for all 
Examples from the Corpus
12 once or twice FEW/NOT MANYa few times 一两次,几次
Examples from the Corpus
13 (just) this once spokenONLY used to emphasize that this is the only time you are allowing something, asking for something etc, and it will not happen again 就这一次
Examples from the Corpus
14 once upon a time 
Examples from the Corpus
15 once in a blue moon informalRARELY very rarely 难得地,破天荒地
Examples from the Corpus
16 do something once too often HARM/BE BAD FORto repeat a bad, stupid, or dangerous action with the result that you get punished or cause trouble for yourself 屡次做坏事[傻事,危险之事]而遭殃
Examples from the Corpus
17 once a ..., always a ...always a ... once a ... spoken used to say that people stay the same and cannot change the way they behave and think 一次是就永远是〔表示一个人的品性是无法改变的〕
18. once is/was enough spoken used to say that after you have done something one time you do not need or want to do it again 一次就够了〔表示你不需要或不想再做了〕
19. once bitten, twice shytwice shy once bitten NOT DO somethingused to say that people will not do something again if it has been a bad experience 一朝被蛇咬,十年怕井绳
Examples from the Corpus
once2 ●●● S1 W1 conjunction  
HAPPENfrom the time when something happens 便,一旦,一经
 Once I get him a job, he’ll be fine.
一旦我帮他找到了工作,他就会好的。
 Once in bed, the children usually stay there.
孩子们一旦上了床,一般就不下来了。
Examples from the Corpus
Origin once1
(1200-1300) one
IELTS BNC: 548 COCA: 300
IELTS BNC: 548 COCA: 300
once adv.
once in a while sometimes
IELTS BNC: 548 COCA: 300
once
Happening only once: once, isolated, unrepeatable...
After another event or time: after, following, since...

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