hair-trigger

Noun

 * 1) A trigger that will set off a firearm when even a very small pressure is applied.

Translations

 * Bulgarian: мек спусък
 * Russian:
 * Spanish: gatillo de pleo

Adjective

 * 1) Unstable; in a situation that could be worsened by the slightest mistake.
 * 2) Easily angered; having a short temper.