"to a hair", 1733 (interdating)

W Brewer brewerwa at GMAIL.COM
Thu Nov 14 07:08:44 UTC 2013

<hair trigger> "a trigger that allows the firing mechanism of a firearm to
be operated by very slight pressure".
<hair> here meaning 'very delicate, sensitive' (as if  the weight of a hair
would set it off) (A nervous & jumpy <hare> springs to mind as a random
association. Elmer Fudd had a hare-trigger temper when it came to cwazy

The American Dialect Society - http://www.americandialect.org

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