Cách sử dụng
The word "underworld" refers to a hidden or secret society of criminals, illegal activities or other murky dealings that are not part of mainstream society. For example, it may refer to a gang or mafia organisation, drug trafficking or smuggling operations, or other illicit or unsanctioned activities. It can also refer to the metaphorical realm of the dead or the afterlife, as in mythology or religious beliefs. The term is typically used in TV shows, movies, books, and other works of fiction or non-fiction that explore criminal or underground activities.