activate (v)
actuate (v)
set off (v)
spark (v)
spark off (v)
touch off (v)
trigger (v)
trigger off (v)
trip (v)

Definition: put in motion or move to act
Example: trigger a reaction. actuate the circuits.

trigger (n)

Definition: a device that activates or releases or causes something to happen

trigger (v)

Definition: release or pull the trigger on
Example: Trigger a gun.

gun trigger (n)
trigger (n)

Definition: lever that activates the firing mechanism of a gun

trigger (n)
initiation (n)
induction (n)

Definition: an act that sets in motion some course of events