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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 ?
My nerves are on a hair-trigger these days," Martin apologized.
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.
I just hope they can put their macho posturing and hair-trigger tempers to one side and act like grown-ups for once.
Emmerdale Mon-Fri, UTV He's always been a bit of a loose cannon with a hair-trigger temper, but now Lachlan White has completely lost the plot.
By his inflammatory rhetoric regarding North Korea, Trump intends "to create the hair-trigger situation on the peninsula and shovel up money by selling the US-made arms and equipment to vassal forces," the commentary read, referring to Japan and South Korea, which the North Korean outlet called "puppets" of Washington.
Alli's hair-trigger temper will be tested to the limit in tonight's World Cup showdown with Scotland's combative skipper Scott Brown in direct competition with Alli in the midfield battleground.
While President Donald Trump is focused on North Korea's nuclear madman, a more alarming threat is rising in South Asia: an explosive mix of nuclear weapons, terrorism and hair-trigger war plans.
Leaders must be capable of rational, calm judgment no matter what the situation, however we've witnessed enough hair-trigger responses and shoot-from-hip pronouncements in recent months to last a lifetime.
I'm not shedding tears for the bookmakers, whose hair-trigger alarm systems would have ensured Yucatan's odds were adjusted before any damage was done.
He was the perfect foil for Chaplin, possessing hair-trigger timing and the world-weary look of a straight man.
This raciest setting gives you a hair-trigger throttle response and most aggressive DSG shifts, while the sound actuator turns the volume up to eleven.