1
general::
Phrase(s): turn someone or something against someone or something
to cause someone to defy or revolt against someone or something; to make someone antagonistic toward someone or something. • He turned the whole board against Molly. • She turned the city council against the proposed law., Phrase(s): turn against someone or something
Go to against someone or something.
McGrawhill's American Idioms And Phrasal Verbs
2
general::
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]
American Heritage Idioms