underworld
n
the underworld [sing]
1 (in mythology) place under the earth inhabited by the departed spirits of the dead (神話中的)陰間, 陰曹.
2 part of society that lives by vice and crime 下流社會; 黑社會
police contacts in the London underworld倫敦黑社會中的警方眼線
[attrib 作定語]
leading underworld figures, ie notorious criminals 黑社會的頭面人物(劣跡昭彰的罪犯).