Antonyms for the phrase "took the part of" include words like opposed, opposed to, hindered, prevented, sabotaged, and resisted. When one takes the part of someone, they are showing their support and siding with them. The opposite of this would be to oppose or hinder that person. For example, if you took the part of a student who was being bullied, the bullies would be the ones opposed to your actions. By resisting the bullies' behavior and preventing them from harming the student further, you could be seen as their opposition. Overall, antonyms for "took the part of" demonstrate the opposition or lack of support towards another person or group.