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

      

    trigger

     noun
    noun
    BrE BrE//ˈtrɪɡə(r)//
     
    ; NAmE NAmE//ˈtrɪɡər//
     
     
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  1. 1the part of a gun that you press in order to fire it to pull/squeeze the trigger He kept his finger on the trigger.
  2. 2trigger (for something) | trigger (to something/to do something) something that is the cause of a particular reaction or development, especially a bad one The trigger for the strike was the closure of yet another factory. Intense sunlight may be a trigger to skin cancer.
  3. 3the part of a bomb that causes it to explode nuclear triggers
  4. Word Origin early 17th cent.: from dialect tricker, from Dutch trekker, from trekken ‘to pull’.
See the Oxford Advanced American Dictionary entry: trigger