The definition of a bristle is a stiff hair.(noun)
An example of a bristle is the pointy part of a stiff hairbrush.
Bristle means to stand like a stiff hair or to show anger.(verb)
An example of to bristle is for a cat's fur to stand straight up when scared.
See bristle in Webster's New World College Dictionary
Origin: ME bristel, metathetic < OE byrst; akin to Ger borste, bristles < IE *bhsti- < base *bhar-, point, bristle
See bristle in American Heritage Dictionary 4
Origin: Middle English bristel
Origin: , probably from Old English *byrstel
Origin: , from byrst, bristle.
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