Definition of "Bristle" :

noun: a stiff hair

noun: a stiff fiber (coarse hair or filament); natural or synthetic

verb: react in an offended or angry manner

"He bristled at her suggestion that he should teach her how to use the program."

verb: rise up as in fear

"The dog's fur bristled."

verb: have or be thickly covered with or as if with bristles

verb: be in a state of movement or action

"The garden bristled with toddlers."