Longman Dictionary of Contemporary English homepage

alert

2 verb
     
alert2 [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
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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