underworld
//ˈʌndərˌwɜːrld//
Noun
underworldSingular
underworldsPlural
1
The world of criminals and organized crime operating beneath the surface of legitimate society.
The police are investigating the city's underworld.
2
In mythology, the realm of the dead located beneath the earth, such as Hades in Greek mythology.
In Greek mythology, Orpheus descended into the underworld to bring back his wife.