alert

 Longman Dictionary of Contemporary English 5++朗文当代英语 5++LDOCE 5++朗文 5++a·lert1 /əˈlɜːt $ -ɜːrt/ ●●○ adjective  1  INTELLIGENTgiving all your attention to what is happening, being said etc 警惕的，警觉的 The animal raised its head, suddenly alert. 那只动物突然警觉地抬起头来。 Taking notes is one of the best ways to stay alert in lectures. 记笔记是听课时集中注意力的最佳方法之一。2  able to think quickly and clearly 机警的，机敏的 Jack was as mentally alert as a man half his age. 杰克的头脑和年龄小他一半的人一样灵活。3  be alert to something CAREFULto know about or understand something, especially a possible danger or problem 警觉某事 The authorities should have been alert to the possibility of invasion. 当局早就应该对入侵的可能性有所警觉了。 —alertness noun [uncountable]

Examples from the Corpus

alert• The men sit up, alert.• The medicine can make it difficult to remain alert.• But working in this sort of hospital you are always aware of the potential and you have to be alert.• Even many of the civilians in Charleston, which lay three miles across the bay from Sumter, were alert and anxious.• Being aware of this, you will be alert and attentive to meaning.• Passengers should try to stay alert at all times, and report any suspicious packages to the police immediately.• For a compulsively pensive person, to be fully alert but free of thought is a form of ecstasy...• an alert driver• She owes her life to an alert farmer, who spotted her car in a ditch and called the emergency services.• He listens with an alert, humorless expression.• The second effort was another wonderfully alert piece of rugby.stay alert• Blue gags on the image, tells himself to stay alert.• The men at the guns stayed alert.• They even set up a neat military system of two-man sentry duties, to make sure they stayed alert.• It was going to be another protracted day; he had to stay alert and miss nothing.• She sank deep down again, unable to stay alert, and saw without wanting to a giant Catherine-wheel in the sky.• You have to get it for yourself, by updating your skills constantly and staying alert to new opportunities.• As he retraced his steps of the past day avoiding streets and roads, he stayed alert to the sounds around him.mentally alert• Bernhardt stated that she continued to sculpt into old age to remain mentally alert.• This applies both to the mentally alert and the mentally confused.• Jamie Shepherd was well over eighty, yet he was as mentally alert as a man half his age.• So the old man went for the rye and champagne, and I mentally alerted my whistle to coming attractions.• I felt stimulated - mentally alert, talkative and sociable.• When I come away from working with Slatkin I always feel more mentally alert than when I started.alert2 ●●○ verb [transitive]  1  WARNto officially warn someone about a problem or danger so that they are ready to deal with it 使警觉；向…发出警报 The school immediately alerted the police. 学校立即报了警。► see thesaurus at warn2  SHOW/LET somebody SEE somethingto make someone realize something important or dangerous 提醒，使〔某人〕意识到alert somebody to something campaigns to alert the public to the dangers of HIV 让公众意识到艾滋病病毒危险的宣传活动→ See Verb table

Examples from the Corpus

alert• When he realized that one engine was not working, the pilot alerted air traffic control.• The perimeter was alerted, and most were awake.• But it was really quite useful, since it alerted his audience to stand by for something unexpected.• Some authors have suggested that the clicks are made to alert other cats to the presence of the prey.• When we find kids circumventing them, we alert our members and try to get the information out as quickly as possible.• a poster campaign to alert people to the disease• The sensors alerted police within seconds and, in some instances, placed the gunshots within 20 feet of their origin.• Drivers are being alerted that an escaped prisoner has been seen hitch-hiking on the road to Frankfurt.• One fireman alerted the residents and helped them to safety.• Echoes of the signal alert them to possible prey, at ranges up to 80-90 metres in shallow waters.alert somebody to something• A large sign alerts drivers to bad road conditions.alert3 noun  1  WARN[countable] a warning to be ready for possible danger 警报a bomb/fire/terrorist etc alert a full-scale flood alert 最高级别的防洪警报 The bomb alert was raised soon after midnight. 刚过子夜，防空警报就拉响了。 → red alert2  on (the) alert (for something/somebody) READYready to notice and deal with a situation or problem （对某事物/某人）保持警惕 Be on the alert for anyone acting suspiciously. 警惕举止可疑的人。 Troops in the vicinity were put on alert. 附近地区的军队受命进入戒备状态。on full alert (also on high alert) (=completely ready to deal with a dangerous situation) 全面戒备 All our border points are on full alert. 我们所有的边防站都处于全面戒备状态。

Examples from the Corpus

alert• If we bypass the decision we simply move into autopilot and the red alert comes into play.• Read in studio A city centre is still sealed off following a security alert earlier this afternoon.• Because of the potential seriousness of the incident, a site alert was announced.• a smog alert• But there is manipulation in these alerts.• He lists a handful of false virus alerts and urban myths.a bomb/fire/terrorist etc alert• Several families were evacuated from their homes in Ulster last night after a bomb alert.• Then their wedding night in a luxury hotel was cut short at 6am - because of a fire alert.Origin alert1 (1500-1600) French alerte, from Italian all' erta “on the watch”

a·lert1 adjectivealert2 verbalert3 nounChineseSyllable  

to all giving attention your Corpus is what

alert

I

a‧lert¹ /əˈlɜːt $ -ɜːrt/ adjective1. giving all your attention to what is happening, being said etc:
    The animal raised its head, suddenly alert.
    Taking notes is one of the best ways to stay alert in lectures.
2. able to think quickly and clearly:
    Jack was as mentally alert as a man half his age.
3. be alert to something to know about or understand something, especially a possible danger or problem:
    The authorities should have been alert to the possibility of invasion.
—alertness noun [uncountable]

II

alert² verb [transitive]
1. to officially warn someone about a problem or danger so that they are ready to deal with it:
    The school immediately alerted the police.
2. to make someone realize something important or dangerous
    alert somebody to something
    campaigns to alert the public to the dangers of HIV
     

THESAURUS

   ▪ warn to tell someone about something bad or dangerous that might happen, so that they can avoid it or prevent it: I warned you about sitting out in the sun too long. | We were warned that there could be delays on the motorway, so we took another route.
   ▪ give somebody a warning to tell someone that if they continue to behave in an unsatisfactory way, they will be punished: He’s already been given several warnings about handing in his essays late. | The 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: a campaign to alert people to the dangers of smoking | An anonymous caller alerted the police that a bomb was due to go off.
   ▪ tip somebody off informal to secretly warn someone about something that is going to happen – used especially about warning the police about a crime: The police found the drugs after being tipped off by local residents. | Informants 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: People are being cautioned against using credit cards abroad, in case of fraud. | Health 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 you are expecting it or ready for it: We had been forewarned that the roads weren’t very good.

III

alert³ noun
1. [countable] a warning to be ready for possible danger
    a bomb/fire/terrorist etc alert
    a full-scale flood alert
    The bomb alert was raised soon after midnight. ⇨ red alert
2. on (the) alert (for something/somebody) ready to notice and deal with a situation or problem:
    Be on the alert for anyone acting suspiciously.
    Troops in the vicinity were put on alert.
    on full alert (also on high alert) (=completely ready to deal with a dangerous situation)
    All our border points are on full alert.
     

THESAURUS

   ▪ warning something that you say or do to tell people about danger, or to tell them not to do something: All cigarette packets carry a government health warning. | She ignored her parents' warnings. | The army issued a warning that anyone who was out on the streets after dark was likely to be shot.
   ▪ caution formal an official warning or a piece of advice telling you to be careful: Caution: do not install electrical equipment near or around water sources. | The video begins with a caution that you must do some warm-up exercises first.
   ▪ tip-off informal a warning that someone is about to do something, especially one given to the police about a crime: Police were called to the hotel after a tip-off.
   ▪ alert a warning to be ready for possible danger that may happen soon: Twelve flood alerts have been issued to areas along the River Severn. | a fire alert | The ambulance services were on red alert (=they were ready to take action immediately).
   ▪ advisory formal an official warning or notice that gives information about a dangerous situation: The air pollution gets so bad on some days that health advisories are posted at park entrances.
   ▪ caveat formal a warning that something may not be completely true, effective etc. Also used when pointing out that it is important to remember something: The woman was offered treatment, but with the caveat that it had only a 30% chance of success. | One caveat is that you must take the goods back to the shop within 14 days. | There is one important caveat to this argument.