turn against
US /tɜːrn əˈɡenst/
UK /tɜːrn əˈɡenst/

1.
voltar-se contra, revoltar-se contra
to become hostile to someone or something; to betray or oppose
:
•
After the scandal, many of his supporters turned against him.
Após o escândalo, muitos de seus apoiadores se voltaram contra ele.
•
The public might turn against the new policy if it causes too many problems.
O público pode se voltar contra a nova política se ela causar muitos problemas.