take sides against

take sides against (someone or something)

To join or form a group that rejects or is opposed to someone or something. I was really surprised when the manager took sides against Carol during the board meeting—I really thought she'd stick up for her. A coalition of 12 countries has taken sides against the aggressive military expansion of the totalitarian nation.
See also: side, take
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

take sides against someone or something

to join a faction opposing someone or something; to establish a faction against someone or something. Both of them took sides against me. It wasn't fair. We took sides against the bank.
See also: side, take
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
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