Definition of alert verb from the Oxford Advanced American Dictionary

     

    alert

     verb
    verb
    NAmE//əˈlərt//
     
    [often passive]Verb Forms present simple I / you / we / they alert
     
    he / she / it alerts
     
    past simple alerted
     
    -ing form alerting
     
     
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  1. 1 alert somebody (to do something) alert somebody (that)… to warn someone about a dangerous or urgent situation Neighbors quickly alerted the police. Alerted by a noise downstairs, he sat up and turned on the light.
  2. 2alert somebody to something to make someone aware of something They had been alerted to the possibility of further price rises.
See the Oxford Advanced Learner's Dictionary entry: alert