The phrase "or against" can be used in a variety of contexts, from politics to sports to personal beliefs. Synonyms for "or against" vary depending on the context, but some common options include "pro" and "anti" for political or social stances, "for" and "versus" for sports or competition, and "for" and "opposed" for personal beliefs. Other possible synonyms include "in favor of" and "against," "supporting" and "opposing," or simply "for" and "against." Choosing the right synonym for "or against" can help clarify your stance on an issue and make your writing or speech more effective and persuasive.