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Definition of underworld noun from the Oxford Advanced American Dictionary

     

    underworld

     noun
    noun
    NAmE//ˈʌndərˌwərld//
     
    [singular]
     
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  1. 1the people and activities involved in crime in a particular place the criminal underworld the Glasgow underworld the dark underworld of drug abuse and petty crime
  2. 2the underworld (in myths and legends, for example those of ancient Greece) the place under the earth where people are believed to go when they die Orpheus in the Underworld
See the Oxford Advanced Learner's Dictionary entry: underworld