Definitions from Wiktionary (netherworld)

▸ noun:  The place to which one's spirit descends upon death, conceived as below the surface of the earth.
▸ noun:  The locale of the spirit world or afterlife, whether deemed to be situated below the world of the living or not.
▸ noun:  Specifically, a location of punishment in the afterlife; a hell.
▸ noun:  (by extension) A hidden, shadowy, or sinister subculture, such as that of organized crime.

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