Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “alert”

See all translations

alert

adjective  /əˈlɜrt/ us  
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]  /əˈlɜrt/ us  
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]  /əˈlɜrt/ us  
The auto company mailed letters to owners of that model car, alerting them of safety risks.
(Definition of alert from the Cambridge Academic Content Dictionary © Cambridge University Press)
What is the pronunciation of alert?
Add Cambridge dictionaries to your browser to your website

Definitions of “alert” in other dictionaries

Word of the Day

derivative

If something is derivative, it is not the result of new ideas, but has been developed from or copies something else.

Word of the Day

Euphemisms (Words used to Avoid Offending People)

by Kate Woodford,
March 04, 2015
​​​ We recently looked at the language that we use to describe lies and lying. One area of lying that we considered was ‘being slightly dishonest, or not speaking the complete truth’. One reason for not speaking the complete truth is to avoid saying something that might upset or offend people. Words and

Read More 

snapchat verb

March 02, 2015
to send someone a message using the photomessaging application Snapchat We used to have a thing until he got a girlfriend. now

Read More