say it: UHN-dur-wurld
underworld is a noun meaning "the criminal class". It carries 2 recorded senses.
the criminal class
(religion) the world of the dead
“No one goes to Hades with all his immense wealth”
religion
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for underworld come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.