Underworld

/ˈʌndərˌwɜrld/

Synonyms

  • criminal underbelly
  • hades
  • netherworld
  • shadow world

Slang Meanings

The criminal underbelly or organized crime.
He got caught up in the underworld, dealing with shady characters.
Underbelly of society.
The documentary explored the underworld of drug trafficking in the city.