abtrünnig — meaning in English

English meaning

apostate noun Someone who has given up their religious faith.
breakaway adj Having split off from a larger group or organization.
runaway noun Someone (or something) that has fled or escaped, especially a person who has left home.

abtrünnig is used for these senses in English:

apostate Guilty of apostasy.
breakaway Having broken away from a larger unit.
go rogue (intransitive, idiom) To defect, or to repudiate allegiance, fealty, affiliation, or membership. (For example, a spy or soldier in relation to a country; or a politician in relation to a political party; or an employee; or a club member.)
runaway (informal) Deserting or revolting against one's group, duties, expected conduct, or the like, especially to establish or join a rival group, change one's life drastically, etc.

noun Someone who has given up their religious faith.
noun (religion) Someone who was ordained and later gives up their role as clergy.
noun Someone who has abandoned a political party or a cause they once supported.

adj Having split off from a larger group or organization.
noun A person or group that pulls ahead of the main pack, especially in cycling or racing.
noun A sudden move to escape or separate from something.