Dictionary.com
definitions

turn against

verb
  1. (preposition) to change or cause to change one's attitude so as to become hostile or to retaliate
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Related Words for turn against

renounce, defy, revolt, secede, resist, overthrow, mutiny, remonstrate, riot, combat, dissent, disobey, upset, denounce, censure, fight, boycott, criticize, oppose, strike
Idioms and Phrases with turn against

turn against

Become or make antagonistic to, as in Adolescents often turn against their parents, but only temporarily, or She turned him against his colleagues by telling him they were spying on him. [First half of 1800s]

The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.