Antonyms for the phrase "taking the part of" could include several options, such as "opposing," "criticizing," "disagreeing," "condemning," and "rebuking." These antonyms reflect a stance of not supporting or advocating for someone or something, instead taking a stance that is opposed or critical. "Opposing" suggests actively working against an idea or individual, while "disagreeing" implies a more passive stance of simply not agreeing with a viewpoint. "Criticizing" and "condemning" both suggest a negative judgment of an idea or individual, while "rebuking" implies a more forceful rejection or disapproval. Overall, these antonyms highlight a stance that is the opposite of supportive or sympathetic.