First and foremost, if you find yourself being bullied a lot as an adult, take a close look at whether you’re playing the victim. Due to your upbringing, you may not even realize that you’re doing it, but often, a bully will instinctively aim for the person who already has a victim mentality. If that’s you, you’ll need to learn to stand up for yourself and become more assertive in the face of the bully.
If all else fails, simply separate yourself from the bully. This may be more difficult to accomplish in a work situation, but be creative, and try to create space between you and the bully. The less you are around them, the less harm they can do.
Also, try to remember that most bullies end up that way because of low self-esteem and a fragile sense of self-worth. By asserting yourself, you take away the bullies’ power, and maybe… just maybe… you’ll show them that they don’t have to be that way.