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English word hair-trigger comes from English hair, English trigger
hair (English)
(botany, countable) A cellular outgrowth of the epidermis, consisting of one or of several cells, whether pointed, hooked, knobbed, or stellated.. (countable) A pigmented filament of keratin which grows from a follicle on the skin of humans and other mammals.. (countable) Any very small distance, or degree; a hairbreadth.. (obsolete) Haircloth; a hair shirt.. (uncountable) The collection or [...]
trigger (English)
(archaic) A catch to hold the wheel of a carriage on a declivity.. (databases) An SQL procedure that may be initiated when a record is inserted, updated or deleted; typically used to maintain referential integrity.. (electronics) A pulse in an electronic circuit that initiates some component.. (online gaming) A text string that, when received by a player, will cause the player to execute a [...]
hair-trigger (English)
A trigger that will set off a firearm when even a very small pressure is applied Easily angered, having a short temper. Unstable, in a situation that could be worsened by the slightest mistake.