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Responding to the slightest provocation or stimulation: a hair-trigger temper; a hair-trigger reaction.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
hair-trigger- 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.
Farlex Trivia Dictionary. © 2012 Farlex, Inc. All rights reserved.