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to choose one side of an argument. They were arguing, but I didn't want to take sides, so I left. I don't mind taking sides on important issues.
Also, take someone's side. Support or favor one party in a dispute, as in Parents shouldn't take sides in their children's quarrels, or Thanks for taking my side concerning the agenda. [c. 1700] Also see take someone's part.
take somebody’s ˈsidesupport one person or group in an argument or disagreement: I refuse to take sides in this argument. It’s nothing to do with me. ♢ Whenever we quarrel, you always take Carole’s side. OPPOSITE: sit on the fence
To associate with and support a particular faction, group, cause, or person.