going rogue

Verb

go rogue (third-person singular simple present goes rogue, present participle going rogue, simple past went rogue, past participle gone rogue)

1. (intransitive) To begin to behave in an erratic, uncontrolled, dangerous, destructive, or savage way.
2. (idiomatic, intransitive) To behave in a very unconventional, independent, uncontrolled, or unauthorized way that ignores rules, norms, or expectations.
   • As the Biden administration and its allies try to secure an elusive cease-fire in Gaza, Israel appears to have gone rogue.2024 August 2, Steven Erlanger, “Netanyahu, Defiant, Appears to Have Gone Rogue, Risking a Regional War”, in The New York Times, →ISSN
3. (idiomatic, intransitive) 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.)