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trigger (n.)

"device by means of which a catch or spring is released and a mechanism set in action," 1650s, earlier tricker (1620s), from Dutch trekker "trigger," from trekken "to pull" (see trek). Tricker was the usual form in English until c. 1750. Trigger-finger "forefinger as used to pull the trigger of a gun" is attested by 1814. Trigger-happy "ready to shoot (or otherwise react violently) on the slightest provocation" is attested from 1942.

trigger (v.)

"cause (something) to happen," 1930, an image from trigger (n.). In recent use especially psychological, "to cause an intense and usually negative emotional reaction (in a person or animal)," by 1986. Related: Triggered; triggering.

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Definitions of trigger from WordNet
1
trigger (n.)
lever that activates the firing mechanism of a gun;
Synonyms: gun trigger
trigger (n.)
a device that activates or releases or causes something to happen;
trigger (n.)
an act that sets in motion some course of events;
Synonyms: induction / initiation
2
trigger (v.)
put in motion or move to act;
trigger a reaction
Synonyms: trip / actuate / activate / set off / spark off / spark / trigger off / touch off
trigger (v.)
release or pull the trigger on;
From wordnet.princeton.edu