IPA: /əˈpɒstəsi/
KK: /əˈpɑːstəsi/
The act of giving up or rejecting a religious belief or loyalty to a faith.
His apostasy shocked his family, who had always been devout followers of their religion.
Apostasy → It is formed from "apo-" (meaning away from) and "stasis" (meaning standing or standing firm). The word describes the act of standing away from or abandoning a belief or faith.
Think of 'standing away' ('apo-') from a belief or faith — that's why apostasy means abandoning one's religious beliefs.