To "alienate" someone means to:

The term "alienate" refers to the action of causing someone to feel isolated or estranged, leading them to become indifferent or distant from a person, group, or society. When someone is alienated, they often experience a sense of being unwelcome or disconnected, which can create emotional distance. This aligns perfectly with the idea of turning someone away or making them indifferent, as it reflects the intention and impact of alienation.

In contrast, the other choices suggest positive actions or outcomes, such as making someone feel included or enhancing feelings of friendship, which do not align with the definition of alienate. The essence of the term lies in its negative connotation of separation and disengagement, which is why the selected answer effectively captures its meaning.