go rogue

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

1. (intransitive, originally of sick elephants) To begin to behave in an erratic, uncontrolled, dangerous, destructive, or savage way.
2. (intransitive, idiomatic) To behave in a very unconventional, independent, uncontrolled, or unauthorized way that ignores rules, norms, or expectations.
3. (intransitive, idiomatic) To switch allegiance to, affiliation with, or membership in, a country, political party, employer, club, etc. (for example, as a spy, soldier, politician, employee, club member, etc.).

• go crazy
• go wild
• run amok