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Responding to the slightest provocation or stimulation: a hair-trigger temper; a hair-trigger reaction.

hair′ trig`ger

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


1. easily activated or set off; put into operation by the slightest impulse.
2. reacting immediately to the slightest provocation: a hair-trigger temper.


- Its underlying meaning is something that may be triggered with the pressure of something as slight as a hair.
See also related terms for slight.


[ˈhɛəˌtrɪgəʳ] ADJ (fig) [temper, reaction] → explosivo
see also hair B
References in classic literature ?
The inmates were asleep, but it was a sleep that was set on a hair-trigger, on account of the exciting episode of the night.
I have always held, too, that pistol practice should be distinctly an open-air pastime; and when Holmes, in one of his queer humors, would sit in an arm-chair with his hair-trigger and a hundred Boxer cartridges, and proceed to adorn the opposite wall with a patriotic V.
My nerves are on a hair-trigger these days," Martin apologized.
Sheffield Wednesday's notorious new striker Gilles de Bilde may have the looks of a choirboy, but he has the fists of a boxer and a hair-trigger temper which could blow at any moment.
A Simi Valley mechanic charged with fatally shooting a young acquaintance told a jail cellmate that he tripped, causing his hair-trigger revolver to fire the deadly shot, according to court testimony Monday.
That rug really pulled the room together,'' declares Dude's friend and bowling partner, Walter (John Goodman), a Vietnam War veteran with a hair-trigger temper.
A combative style mixed with a hair-trigger temper.
Everyone becomes a kind of libertarian before they think too hard about condemnation, especially if their life is in the hair-trigger,'' Lefcoe said.
There's Nadia's ``cousin'' Yuri (``Crimson River'' director and ``Amelie'' leading man Mathieu Kassovitz) and his hyperactive, hair-trigger friend Alexei (Vincent Cassel, whom Kassovitz directed in ``Hate'').
My first, hair-trigger reaction (to the controversy) was, `You joined the tour, you follow the rules.
Other than Ciro Ferrara's scything foul on Ruud van Nistelrooy and ref Kim Nielsen failing to give a penalty when Juventus's keeper felled the Dutchman, there were few glimpses of the hair-trigger temperament.
The guy with such a hair-trigger temper, his peers dubbed him ``Volcano''?