Definition of trigger verb from the Oxford Advanced American Dictionary

      

    trigger

     verb
    verb
    NAmE//ˈtrɪɡər//
     
    Verb Forms present simple I / you / we / they trigger
     
    he / she / it triggers
     
    past simple triggered
     
    -ing form triggering
     
     
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  1. 1trigger something (off) to make something happen suddenly synonym set off Nuts can trigger off a violent allergic reaction.
  2. 2trigger something to cause a device to start functioning synonym set off to trigger an alarm
See the Oxford Advanced Learner's Dictionary entry: trigger