apostate
/əˈpɒsteɪt/Definitions
1. noun
A person who has abandoned their faith or principles, especially in a shocking or public way.
“The former politician was accused of being an apostate after switching parties.”
2. noun
A person who has abandoned their allegiance to a country or cause.
“The spy was considered an apostate after defecting to the enemy’s side.”
3. verb
To abandon one’s allegiance or faith, especially in a shocking or public way.
“The whistleblower was said to have apostatized after exposing the company’s corruption.”