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hair-trigger

[hair-trig-er] /ˈhɛərˌtrɪg ər/
adjective
1.
easily activated or set off; reacting immediately to the slightest provocation or cause:
a hair-trigger temper.
Origin
1885-1890
1885-90
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Word Origin and History for more hair trigger

hair-trigger

n.

1830, originally a secondary trigger in a firearm which sprung free a mechanism (hair) which, when set, allowed the main trigger (n.) to be released by very slight force. Figurative use by 1841.

Online Etymology Dictionary, © 2010 Douglas Harper
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