1 hair, whisker, barb, prickle, thorn, quill, Technical seta:
Shaving brushes are often made from badger bristles.
2 prickle, rise, stand up, Formal horripilate:
He could feel the hair on the back of his neck bristle.
3 seethe, become angry or infuriated or furious or maddened, boil, flare up, see red, bridle:
He bristled with enraged frustration.
4 teem, crawl, be thick, swarm, be alive:
The sea urchin was bristling with sharp spines.