- Hair trigger defines something that responds or happens easily or without cause.
An example of hair trigger is a person who gets angry instantly; a hair trigger temper.
- The definition of a hair trigger is a gun trigger that goes off with a very light squeeze.
An example of a hair trigger is a pistol that's been adjusted so it goes off very easily.
hair trigger definition by Webster's New World
a trigger so delicately adjusted that a very slight pressure on it discharges the firearm
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
set in motion or operation by a very slight impulse
Origin: see hair trigger
hair trigger definition by American Heritage Dictionary
A gun trigger adjusted to respond to a very slight pressure.
Responding to the slightest provocation or stimulation: a hair-trigger temper; a hair-trigger reaction.