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The lever pressed by the finger to discharge a firearm.
(noun)
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A similar device used to release or activate a mechanism.
(noun)
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An event that precipitates other events.
(noun)
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Electronics A pulse or circuit that initiates the action of another component.
(noun)
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To set off; initiate: remarks that triggered bitter debates.
(verb-transitive)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.