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TOEFL BNC: 1512 COCA: 1773

warn

Word family 
warn /wɔːn $ wɔːrn/ ●●● S3 W2 verb [intransitiveI, transitiveT] → worn
1  WARNto tell someone that something bad or dangerous may happen, so that they can avoid it or prevent it 警告，告誡；提醒
‘Be careful, the rocks are slippery, ’ Alex warned.
“小心，岩石很滑。”亞歷克斯提醒說。
warn somebody about something
Travellers to Africa are being warned about the danger of HIV infection.
去非洲旅行的人被警告要注意感染艾滋病的危險。
warn (somebody) of something
Salmon farmers are warning of the severe crisis facing the industry.
鲑魚養殖場主警告說該行業正面臨嚴重危機。
warn somebody (not) to do something
I warned you not to walk home alone.
我告誡過你不要一個人走路回家。
Motorists are being warned to avoid the centre of London this weekend.
現正提醒駕車者本周末要繞行倫敦市中心道路。
warn somebody (that)
We warned them that there was a bull in the field.
我們提醒他們，田裏有一頭公牛。
2  WARNto tell someone about something before it happens so that they are not worried or surprised by it 預先通知〔某人以免其擔憂或驚訝〕
warn somebody (that)
Warn her you’re going to be back late.
提前告訴她你要晚回去。
 Register
In everyday English, people often use the expression let someone know rather than warn someone: 在日常英語中，人們一般用 let someone know，而不用 warn someone
Let me know if you’re not going to finish on time.
如果你不能準時完成的話，就提早告訴我。
3 warn (somebody) against something phrasal verbphr v WARNto advise someone not to do something because it may have dangerous or unpleasant results 〔因可能有危險或産生不良結果而〕告誡(某人)不要做〔某事〕
Her financial adviser warned her against such a risky investment.
她的理財顧問告誡過她不要進行風險那麽大的投資。
warn (somebody) against doing something
The police have warned tourists against leaving the main tourist centres.
警方告誡遊客不要離開主要旅遊中心。
4 warn somebody ↔ away phrasal verbphr v to tell someone that they should not go near something, especially because it may be dangerous 警告〔某人〕不要靠近
The snake’s markings are intended to warn away predators.
蛇身上的斑紋是用來警告捕食者不要靠近。
Examples from the Corpus
warn away• Perhaps the old warn the Young away from their own failed dreams.
5 warn off phrasal verbphr v 
a) THREATEN warn somebody ↔ off to tell people that they should not go near something, especially because it might be dangerous 警告某人不要靠近
Some animals mark their territory to warn off rivals.
有些動物在自己的地盤上留下記號，警告競爭者不要靠近。
b) WARN warn somebody off (doing) something especially British EnglishBrE to tell someone that they should not do or use something because it might be dangerous 告誡某人不要用某物/做某事
Doctors should have warned people off using the drug much earlier than they did.
醫生早就應該告誡人們不要使用這種藥品。
n GRAMMAR: Patterns with warn
You warn someone that something will happen (=you say it will definitely happen):
I must warn you that the treatment will have side effects.
In the past, you say that someone warned that something would happen (=they said that it would definitely happen):
Campaigners warned that the airport would harm the environment.
You warn that something might happen or could happen:
He warned that there might be another war.
Warn is also often used in the passive. You say that someone was warned about something:
We were warned about the dangers of global warming.
 THESAURUS
warn to tell someone about something bad or dangerous that might happen, so that they can avoid it or prevent it 警告；提醒
I warned you about sitting out in the sun too long.
我提醒過你别在外面太陽底下坐太長時間。
We were warned that there could be delays on the motorway, so we took another route.
有人提醒我們說走高速公路可能會有延誤，因此我們走了另一條路線。
give somebody a warning to tell someone that if they continue to behave in an unsatisfactory way, they will be punished 〔就不良行爲〕警告某人
He’s already been given several warnings about handing in his essays late.
他因爲晚交論文已經受到好幾次警告。
nThe US gave a warning that if the hostages were not released, it would be forced to take military action.
alert to officially or publicly warn people of possible danger so that they can prevent it or be ready to deal with it 〔官方或公開地〕警告，報警
a campaign to alert people to the dangers of smoking
提醒人們注意吸煙危害的運動
An anonymous caller alerted the police that a bomb was due to go off.
一個匿名者打電話報警，說有一枚炸彈即將爆炸。
tip somebody off informal to secretly warn someone about something that is going to happen – used especially about warning the police about a crime 秘密警告某人；〔尤指〕向警察密報
The police found the drugs after being tipped off by local residents.
警方得到當地居民的密報，找到了這批毒品。
nInformants tipped the FBI off.
caution formal to warn someone to do or not to do something in order to avoid a dangerous or bad result 警告，告誡
People are being cautioned against using credit cards abroad, in case of fraud.
人們得到警告說爲防止被詐騙，不要在國外使用信用卡。
nHealth officials have cautioned the public to wash fruit thoroughly before eating it.
forewarn /fɔːˈwɔːn $ fɔːrˈwɔːrn/ [usually passive] formal to warn someone about something that is going to happen, so that they are expecting it or ready for it 預先警告；事先告知
We had been forewarned that the roads weren’t very good.
我們預先得到提醒說道路狀況不太好。
Examples from the Corpus
warn• Tourists are warned against going to remoter regions.• But they should at least be warned, and wary.• Police are warning drivers not to go out on the roads unless their journey is really necessary.• We tried to warn her, but she refused to listen.• He would be the one Rostov had warned him to be wary of.• Something warned Lucy that she must stop him.• I was going for a swim, until the people in the hotel warned me about the jellyfish.• When I married my first Guenever you warned me that the marriage might be unwholesome for me.• Weather forecasters warned of possible flooding in coastal regions.• Dark clouds warned of the approaching storm.• A senior official in the State Statistical Bureau warned that demand had to be controlled to avoid runaway inflation.• Cooley warns that one should go slowly and not slip at the last rung of the ladder.• The local people were warned that the volcano might erupt at any time.• The bleached bones of cattle warn the traveler how hot it can be in Death Valley.• We were warned there were going to be delays on the motorway, so we came back by a different route.• The consequences could be serious - I just wanted to warn you.• Just warn your friend Martin to be extra careful, because everything he does is under close scrutiny.
warn somebody (that)• Be warned that the photos contain graphic violent images.
Origin warn
Old English warnian

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