Expostulate with is a phrase that is used to describe vehemently disagreeing with someone or arguing against them. There are many other words that can be used as synonyms for this phrase, including confront, remonstrate, protest, rebuke, reprimand, and admonish. Each of these words carries its own nuances and connotations, but all of them are similar in that they involve standing up to someone and expressing your disagreement or disapproval. Whether you're trying to negotiate a business deal or resolve a personal conflict, using synonyms for expostulate with can help you communicate your point of view more effectively and assertively.