What is the meaning of amuck?

adjective

• Frenzied as if possessed by a demon.
  • usage: "the soldier was completely amuck"; "berserk with grief"; "a berserk worker smashing windows"
  • synonyms: amok, berserk, demoniac, demoniacal, possessed

adverb

• Wildly; without self-control.
  • usage: "when the restaurant caught fire the patrons ran amuck, blocking the exit"
  • synonyms: amok
• In a murderous frenzy.
  • usage: "rioters running amuck and throwing sticks and bottles and stones"
  • synonyms: amok, murderously