What is the meaning of Bristle?

A stiff or coarse hair, usually and especially on a nonhuman mammal.

A chaeta: an analogous filament on arthropods, annelids, or other animals.

The hairs or other filaments that make up a brush, broom, or similar item, typically made from plant cellulose, animal hairs, or synthetic polymers.

To rise or stand erect, like bristles.

To abound, to have an abundance of something, especially something jutting out.

(with at) To be on one's guard or raise one's defenses; to react with fear, suspicion, or distance.

To fix a bristle to.

Source: wiktionary.org