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trig·ger  audio  (trgr) KEY 

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:
trig·gered, trig·ger·ing, trig·gers
  1. To set off; initiate: remarks that triggered bitter debates.
  2. To fire or explode (a weapon or an explosive charge).
ETYMOLOGY:
Dutch trekker, from Middle Dutch trecker, from trecken, to pull


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