the.com/bristly

Nature's velcro, a personality, and a beard verdict — all standing perfectly on edge

means Covered in short, stiff, prickly hairs or points — or, of a person, easily irritated and quick to take offense.

from From "bristle," the stiff hair of a pig or boar, which traces back to Old English "byrst" (bristle), a cousin of Old Norse and German words for the same coarse hair. The "-ly" simply turns the noun into an adjective: "like bristles." The leap from a hog's hackles to a touchy temperament is an old and natural one — when an animal or a person bristles, the hairs (or the hackles) literally rise.

root word
From Old English byrst, meaning a stiff hair
hog source
Boar bristles built brushes for centuries
defense mode
Hedgehogs and porcupines bristle to look unkissable
mood usage
People bristle at insults, hairs metaphorically raised
for instance

hedgehog — mammal with 5,000-7,000 spines covering its body for defense

sea urchin — marine animal with brittle spines across its spherical shell

porcupine — rodent with up to 30,000 barbed quills on its back and tail

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