Definition of hair-trigger
(Entry 1 of 2)
1
: immediately responsive to the slightest stimulus
a hair-trigger temper
2
: delicately adjusted or easily disrupted
hair trigger
nounDefinition of hair trigger (Entry 2 of 2)
: a gun trigger so adjusted as to permit the firearm to be fired by a very slight pressure
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Merriam-Webster unabridged
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Time Traveler for hair-trigger
The first known use of hair-trigger was in 1802
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