trigger

Noun
  1. Lever that activates the firing mechanism of a gun (synset 103475752)
    is a type of: lever - a rigid bar pivoted about a fulcrum
    subtypes: hair trigger - a gun trigger that responds with little pressure
    is a part of: gun - a weapon that discharges a missile at high velocity (especially from a metal tube or barrel)
    same as: gun trigger
  2. A device that activates or releases or causes something to happen (synset 104490329)
    is a type of: device - an instrumentality invented for a particular purpose
    subtypes: plutonium pit, plutonium trigger - a steel or beryllium sphere containing plutonium 239 that triggers nuclear fission when compressed by explosives
  3. An act that sets in motion some course of events (synset 100157210)
    is a type of: causation, causing - the act of causing something to happen
    subtypes: fomentation, instigation - deliberate and intentional triggering (of trouble or discord)
    same as: induction, initiation
Verb
  1. Put in motion or move to act (synset 201647199)
    "trigger a reaction"; "actuate the circuits"
    causes: come about, fall out, go on, hap, happen, occur, pass, pass off, take place - come to pass
    is a type of: initiate, pioneer - take the lead or initiative in; participate in the development of
    same as: activate, actuate, set off, spark, spark off, touch off, trigger off, trip
  2. Release or pull the trigger on (synset 201137797)
    "Trigger a gun"
    entail: discharge, fire - cause to go off

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