Dictionary![]() ![]() hair' trig"gera trigger that allows the firing mechanism of a firearm to be operated by very slight pressure. hair-trig•gerPronunciation: (hâr'trig"ur), [key] —adj. easily activated or set off; reacting immediately to the slightest provocation or cause: a hair-trigger temper. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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