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Synonyms
trig·ger (trĭǵər)

[Dutch trekker, from Middle Dutch trecker, from trecken, to pull.]

noun 

    1. The lever pressed by the finger to discharge a firearm.
    2. A similar device used to release or activate a mechanism.
  2. An event that precipitates other events.
  3. Electronics A pulse or circuit that initiates the action of another component.

transitive verb: -gered, -ger·ing, -gers. 

  1. To set off; initiate: remarks that triggered bitter debates.
  2. To fire or explode (a weapon or an explosive charge).