Definition of “turn against someone/something” - English Dictionary

American

“turn against someone/something” in American English

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turn against someone/something

phrasal verb with turn us /tɜrn/ verb

to change from supporting to opposing someone or something:

A lot of his supporters turned against him.
Their idea is that the immune system turns against the body because it isn't exposed to enough germs.

(Definition of “turn against someone/something” from the Cambridge Academic Content Dictionary © Cambridge University Press)