trigger - definition and synonyms

noun [countable]  /ˈtrɪɡə(r)/
  1. 1
    the part of a gun that you move with your finger to make the gun fire
    pull/squeeze the trigger:

    She lifts her gun and pulls the trigger.

     Synonyms and related words
  2. 2
    something that produces an immediate result
    trigger for:

    It was the trigger for a whole new investigation.

     Synonyms and related words