Do not bully people.

I think 不要欺负某人 means "Don't bully someone". I'm pretty sure 欺负means to bully someone, in English, "bully" can be used as a noun too. Not sure whether or not it's used that way in Chinese, but here are some examples of how they look in both as verbs and as nouns: In this sentence it's used as a verb: Sarah! Don't bully that helpless nerd. In this sentence it's used as a noun: Sarah's just a big bully. Hope this helped.

bully 某个人 or take advantage of 某个人

...overbearing....bully....overpowering,,...bossy,...high-handed