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underworld (n.)

c. 1600, "the lower world, Hades, place of departed souls," also "the earth, the world below the skies," as distinguished from heaven. Similar formation in German unterwelt, Dutch onderwereld, Danish underverden. Meaning "lower level of society" is first recorded 1890; "criminals and organized crime collectively" is attested from 1900.

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Definitions of underworld from WordNet

underworld (n.)
the criminal class;
underworld (n.)
(religion) the world of the dead; "No one goes to Hades with all his immense wealth"-Theognis;
Synonyms: Hell / Hades / infernal region / netherworld / Scheol
From wordnet.princeton.edu