hair trigger

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hair trigger

A gun trigger adjusted to respond to a very slight pressure.

hair trigger

1. (Firearms, Gunnery, Ordnance & Artillery) 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.

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.
ThesaurusAntonymsRelated WordsSynonymsLegend: trigger - a gun trigger that responds with little pressure
gun trigger, trigger - lever that activates the firing mechanism of a gun
References in periodicals archive ?
Now scientists have discovered another previously unknown function of Tregs, as hair triggers.
How hair triggers twitch in dark rooms half a world away and infiltrate
The borders of NATO member nations were once hair triggers for nuclear war with the Soviets.