Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

  

alert

noun [C or U]
 
 
/əˈlɜːt/ US  /-ˈlɝːt/

Definition

C1 a warning to people to be prepared to deal with something dangerous: a bomb alert The army was put on (full) alert as the peace talks began to fail. The public were warned to be on the alert for (= watching carefully for) suspicious packages.Threats and warningsEmergency services in general
(Definition of alert noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

“alert” in other dictionaries

Word of the Day

come rain or shine

whatever happens

Word of the Day

Blog

Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More