underworld
definitions
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noun
the criminal or illegal activities of a city or country; the lower social classesen: the criminal or illegal activities of a city or country; the lower social classes
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noun
the region beneath the earth's surfaceen: the region beneath the earth's surface
examples
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The police investigated the underworld.
The police investigated the underworld.
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Miners work deep in the underworld.
Miners work deep in the underworld.