Definition of alert verb from the Oxford Advanced Learner's Dictionary

     

    alert

     verb
    verb
    BrE BrE//əˈlɜːt//
     
    ; NAmE NAmE//əˈlɜːrt//
     
    [often passive]Verb Forms present simple I / you / we / they alert
    BrE BrE//əˈlɜːt//
     
    ; NAmE NAmE//əˈlɜːrt//
     
    he / she / it alerts
    BrE BrE//əˈlɜːts//
     
    ; NAmE NAmE//əˈlɜːrts//
     
    past simple alerted
    BrE BrE//əˈlɜːtɪd//
     
    ; NAmE NAmE//əˈlɜːrtɪd//
     
    past participle alerted
    BrE BrE//əˈlɜːtɪd//
     
    ; NAmE NAmE//əˈlɜːrtɪd//
     
    -ing form alerting
    BrE BrE//əˈlɜːtɪŋ//
     
    ; NAmE NAmE//əˈlɜːrtɪŋ//
     
    Terrorism
     
    jump to other results
  1. 1alert somebody (to do something) | alert somebody (that)… to warn somebody about a dangerous or urgent situation Neighbours quickly alerted the emergency services. Alerted by a noise downstairs, he sat up and turned on the light. See related entries: Terrorism
  2. 2alert somebody to something to make somebody aware of something They had been alerted to the possibility of further price rises.
  3. Word Origin late 16th cent. (originally in military use): from French alerte, from Italian all' erta ‘to the watchtower’.
See the Oxford Advanced American Dictionary entry: alert