Definition of “thug”

verb:
- To commit acts of thuggery, to live the life of a thug, or to dress and act in a manner reminiscent of someone who does.
  
  from Wiktionary, Creative Commons Attribution/Share-Alike License
noun:
- One of a band of assassins formerly active in northern India who worshipped Kali and offered their victims to her.
  
  from Wiktionary, Creative Commons Attribution/Share-Alike License
- A criminal with an intimidating and unseemly appearance and mannerisms, who treats others violently and roughly, especially for hire.
  
  from Wiktionary, Creative Commons Attribution/Share-Alike License