Trigger - Definition

n 1: lever that activates the firing mechanism of a gun [syn:
gun trigger, trigger]
2: a device that activates or releases or causes something to
happen
3: an act that sets in motion some course of events [syn:
trigger, induction, initiation]
v 1: put in motion or move to act; "trigger a reaction";
"actuate the circuits" [syn: trip, actuate, trigger,
activate, set off, spark off, spark, trigger off,
touch off]
2: release or pull the trigger on; "Trigger a gun"