Bullies cannot be bullies by themselves. They need someone they can bully. How can you prevent yourself from being bullied? Check out this article.
If you work with a bully, this is all you need to know. They need you.
A bully is someone who uses physical or psychological force to demean and demoralize someone else. A bully isn’t challenging your ideas, or working with you to find a better outcome. A bully is playing a game, one that he or she enjoys and needs. You’re welcome to play this game if it makes you happy, but for most people, it will make you miserable. So don’t.