To rebel or oppose to something formerly supported.(verb)
To set against or in opposition to something.(verb)
To use to the disadvantage or injury of.(verb)
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Use "turn against" in a sentence
"And both would go far in explaining not only why millions of autoimmune sufferers like Jan Pankey and Kathleen Arntsen would be underdiagnosed, undertreated, and marginalized once they did become ill, but why their bodies were so much more likely to turn against their own healthy tissue in an autoimmune reaction in the first place."
"And yet, Johnson felt he needed these peoplebecause he knew they brought exceptional qualities to government, and because he could ill afford to have them leave and turn against him."
"One research study found that those experiencing chronic stress had higher levels of interleukin-6, or IL-6, which are pro-inflammatory cytokines that act as signaling messengers between cells of the immune system and which can whip up the immune cells to turn against the body itself."