hair trigger

noun
a trigger that allows the firing mechanism of a firearm to be operated by very slight pressure.

Origin:
1815–25

Dictionary.com Unabridged

hair-trig·ger

[hair-trig-er]
adjective
easily activated or set off; reacting immediately to the slightest provocation or cause: a hair-trigger temper.

Origin:
1885–90

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
Cite This Source Link To hair-trigger
00:10
Hair-trigger is always a great word to know.
So is flibbertigibbet. Does it mean:
the offspring of a zebra and a donkey.
a chattering or flighty, light-headed person.
Collins
World English Dictionary
hair trigger
 
n
1.  a trigger of a firearm that responds to very slight pressure
2.  informal
 a.  any mechanism, reaction, etc, set in operation by slight provocation
 b.  (as modifier): a hair-trigger temper

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
The realization that shooting first provides a huge advantage over an adversary
  leads to hair-trigger vigilance.
They reported the same nightmares, the same panics, the same hair-trigger
  vigilance their parents had.
Avoid adverse reactions and sidestep hair-trigger tempers by carefully
  considering your words.
Banning the hair-trigger loss of promotional interest rates.
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