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side with (someone or something)
To join or align with someone or something; to support, favor, or share the opinion of someone or something. The judge sided with the tech company, stating that the plaintiff didn't have enough credible evidence. Sorry, Dave, I'm afraid I have to side with Bill on this issue. It was the only country to side with the rebel group, offering them military and financial aid.
side with someone
to join with someone; to take someone else's part; to be on someone's side. Why is it that you always side with him when he and I argue? I never side with anybody. I form my own opinions.
Support or favor, as in The Armenians traditionally side with the Greeks against the Turks. This idiom was first recorded in 1600. For the antonym, see side against.
To align oneself with someone or something in a disagreement: The stalemate ended when a small group of senators sided with the opposing party.