Trigger (film)
WordNet
noun
(1) An act that sets in motion some course of events
(2) Lever that activates the firing mechanism of a gun
(3) A device that activates or releases or causes something to happen
verb
(4) Release or pull the trigger on
"Trigger a gun"
(5) Put in motion or move to act
"Trigger a reaction"
"Actuate the circuits"