English

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

      

    trigger

     verb
    verb
    BrE BrE//ˈtrɪɡə(r)//
     
    ; NAmE NAmE//ˈtrɪɡər//
     
    Verb Forms present simple I / you / we / they trigger
    BrE BrE//ˈtrɪɡə(r)//
     
    ; NAmE NAmE//ˈtrɪɡər//
     
    he / she / it triggers
    BrE BrE//ˈtrɪɡəz//
     
    ; NAmE NAmE//ˈtrɪɡərz//
     
    past simple triggered
    BrE BrE//ˈtrɪɡəd//
     
    ; NAmE NAmE//ˈtrɪɡərd//
     
    past participle triggered
    BrE BrE//ˈtrɪɡəd//
     
    ; NAmE NAmE//ˈtrɪɡərd//
     
    -ing form triggering
    BrE BrE//ˈtrɪɡərɪŋ//
     
    ; NAmE NAmE//ˈtrɪɡərɪŋ//
     
     
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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
  3. Word Origin early 17th cent.: from dialect tricker, from Dutch trekker, from trekken ‘to pull’.Extra examples A wide range of emotionally stressful events may trigger a relapse. An influx of refugees has triggered disturbances. Even the smell of oranges can trigger her migraine. He suffers from a brain disorder that can trigger off convulsive fits. The burglars fled after triggering the alarm.
See the Oxford Advanced American Dictionary entry: trigger