- (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
Idioms and Phrases with 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.