The phrase "side with" refers to showing support or agreement with someone or something. There are many synonyms for this phrase, including "align with," "back," "support," "champion," "endorse," "favor," "stand by," and "take the part of." These synonyms all convey the same idea of choosing to support a particular person, group, or ideology. It's important to have a variety of synonyms for expressing these ideas in order to avoid repetition in our language. By utilizing different words and phrases, we can more effectively convey our thoughts and opinions to others.