alertness
alert
noun
uk /əˈlɜːt/ us /əˈlɝːt/
C1[ C or U ]
a warning to people to be prepared to deal with something dangerous: 警报
a bomb alert炸弹警报
The army was put on (full) alert as the peace talks began to fail.当和谈开始破裂的时候，军队进入（全面）戒备状态。
The public were warned to be on the alert for(= watching carefully for) suspicious packages.有关部门提醒公众，要警惕可疑包裹。
[ C ]
a message, for example on your mobile phone or on television or radio, that warns you or gives you information about something:
You can set location-based alerts so your phone will remind you of something important when you are arriving at or leaving a location.
I get text alerts when I have used 80% of my mobile data.
Sign up to receive news alerts in your area.

SMART Vocabulary: related words and phrases

Threats & warnings
advance warning
alarm
alarm bell
bell-ringing
beware the ides of Marchidiom
bow
brushback pitch
burglar alarm
cautionary
cautionary tale
dare
early warning system
hear warning bellsidiom
minatory
one swallow doesn't make a summeridiom
protection racket
red alert
red flag
scare quotes
yellow card

You can also find related words, phrases, and synonyms in the topics:

Emergency services in general
Communications - general words
alert
verb[ T ]
uk /əˈlɜːt/ us /əˈlɝːt/
C2
to warn someone of a possibly dangerous situation: 使警觉，使警惕;向…发出警报
An anonymous letter alerted police to the possibility of a terrorist attack at the airport.有人给警察写了一封匿名信，警告机场可能会受到恐怖袭击。
If you hear a flood warning, please alert your neighbours and make emergency preparations.
Until I saw my statement, there was nothing to alert me that someone else was using my credit card number.
We encourage parents to alert the school about any concerns or difficulties at home.
We don't want to alarm people unnecessarily, but they should be alerted to potential dangers.
A note of formality in his voice alerted her to the fact that others were listening.他语气中的一丝拘谨提醒了她有别人在听他们的谈话。

SMART Vocabulary: related words and phrases

Threats & warnings
advance warning
alarm
alarm bell
bell-ringing
beware the ides of Marchidiom
bow
brushback pitch
burglar alarm
cautionary
cautionary tale
dare
early warning system
hear warning bellsidiom
minatory
one swallow doesn't make a summeridiom
protection racket
red alert
red flag
scare quotes
yellow card

alert | American Dictionary

alert
adjective
us/əˈlɜrt/
quick to see, understand, and act in a particular situation:
When you’re driving, you must stay alert.
We had to be alert to any danger signs in the economy.
alert
noun[ C/U ]
us/əˈlɜrt/
a warning to people to get ready to deal with something dangerous:
[ U ]The police were on the alert for (= watching carefully for) any sign of trouble.

alert

verb[ T ]us/əˈlɜrt/
The auto company mailed letters to owners of that model car, alerting them of safety risks.

Examples of alert

alert
Difficult relations with coal operators alerted labour to the danger of divide-and-rule tactics.
He also alerts us to the dangers of affluent baby boomers using their political clout to get policy precedence.
Thus, it constantly alerted the government to the need of keeping a tight rein on criminal and subversive elements.
The instant we hear 'lest' our minds are alerted to concentrate on the significance of the following clause.
Information from the dorsal stream alerts the organism to the fact that something of potential interest or importance is out there.
Her study also alerts us to the fact that collaboration has social and personal consequences for participants.
In addition, the service provides all users with free access to tables of contents and abstracts, and a free email alerting service.
What is called for is a reporting system that monitors all expenditures and alerts the government to potential overruns.
An additional 21 new participants were recruited to the study in 1991 by alerting area clinics that participants were being sought for the study.
His retreating to her when he has been startled, alerted, slightly hurt, mildly frightened or fatigued seldom elicits her attention.
Punctuation delineates rhetorical structure, so that a reader can be explicitly alerted to certain formal contrivances relevant to the communicative significances embodied in a text.
The number of parent falsely alerted for every true case found is minimal.
Another incident occurred in 1986 that alerted me to the growth of a new and alternative world view and ethos.
The table also alerts readers to passages where the variants are minor enough to be reportable in the critical notes.
A friend alerted me to the need for funds.
See all examples of alert
These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors.