alert - definition and synonyms

verb [transitive] 

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present tense
present participlealerting
past tensealerted
past participlealerted
  1. 1
    to tell someone in authority about a danger or problem so that they can take action to deal with it

    Neighbours heard the car being broken into and alerted the police.

  2. 2
    formal to tell someone about something that may affect them
    alert someone to something:

    We will be assisting in alerting people to the dangers of cold weather.