Hair-trigger definitions

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.

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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.

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A gun trigger adjusted to respond to a very slight pressure.
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Responding to the slightest provocation or stimulation.

A hair-trigger temper; a hair-trigger reaction.

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A trigger so delicately adjusted that a very slight pressure on it discharges the firearm.
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Set in motion or operation by a very slight impulse.
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A trigger that will set off a firearm when even a very small pressure is applied.
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Unstable, in a situation that could be worsened by the slightest mistake.
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Easily angered, having a short temper.
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Origin of hair-trigger

compound hair + trigger