Where does “hair trigger” come from?

hair trigger (English) comes from English Hair, from Middle English hēr, from Old English hēr, from Proto-West Germanic *hēr, from Proto-Germanic hē₂r, from Proto-Indo-European ḱe, from Middle English kyt, from German kitt — to bend; curve; arch; vault; to bow, bend, arch,...

hair trigger (English): Alternative form of hair-trigger; Any unstable...

Definitions

  1. Alternative form of hair-trigger; Any unstable...

Ancestry of “hair trigger”, step by step

hair trigger traces back through two separate lines of ancestry.

via English Hair

StepLanguageWordMeaning
1EnglishHairA pigmented filament of keratin which grows from a follicle on the skin of humans and other mammals
2Middle Englishhēra hair
3Old Englishhērat this place
4Proto-West Germanic*hērhere
5Proto-Germanichē₂rhere, in this place
6Proto-Indo-EuropeanḱeDeictic particle, here; Post-positional...
7Middle Englishkyt
8Germankittputty certain kinds of cement used for fixing e.g. window panes
9Old High Germankuti
10Proto-West Germanickwidugum, resin
11Proto-Germanickweduzresin
12Proto-Indo-Europeangʷet-resin, gum; to say, speak
13Proto-Indo-Europeangū-to bend; curve; arch; vault; to bow, bend, arch,...

via English trigger

StepLanguageWordMeaning
1EnglishtriggerA finger-operated lever used to fire a gun; A...
2Dutchtrekkerpuller; trigger; tractor
3Dutchtrekkento pull, to draw; to manage, to have the strength...
4Middle Dutchtreckento pull or draw to oneself; to go to another...
5Old Dutchtrecken
6Proto-West Germanic*trakkjanto drag
7Proto-Germanictrakjanąto drag
8Proto-Germanic-janąDerives denominatives from nouns and factitives...
9Proto-Indo-European-yétiCreates intransitive, often deponent,...
10Proto-Indo-Europeanyé-
11Chichewaiyehe, she
Every word from Proto-Indo-European gū-Every word from Proto-Indo-European gʷet-Every word from Proto-Germanic kweduz