Which word describes the process of turning someone hostile?

The word "alienate" accurately describes the process of turning someone hostile because it specifically refers to making someone feel isolated or estranged, which can lead to feelings of hostility. When a person is alienated, they often feel neglected or unwelcome, which can nurture resentment or anger towards others. This term captures the essence of creating a divide in relationships, causing individuals to feel separate from a group or individual they might have once felt connected to.

In contrast, the other options do not convey the sense of fostering hostility. "Fallow" pertains to land that has been left unplanted, while "demise" refers to death or the end of something, neither of which imply hostile feelings. "Harass" involves aggressive pressure or intimidation but does not specifically relate to the process of making someone feel hostile; rather, it conveys hostile actions already being taken against someone.