"Demean yourself" essentially means to conduct oneself in a way that is unacceptable or shameful. There are many synonyms that could be used to express this notion, such as "degrade yourself," "lower yourself," "debase yourself," or "humiliate yourself." Another way to describe this type of behavior would be to say that someone is "acting beneath themselves" or "behaving in a disgraceful manner." It is important to use the right words when describing negative behavior in order to effectively convey the severity of the situation and make it clear that such actions are not acceptable.