underworldn.
英 'ʌndəwɜːld | 美 'ʌndɚ'wɝld
中文n. 黑社会；地狱；下层社会；尘世
词根词源
underworld (n.)c. 1600, "the lower world, Hades, place of departed souls," also "the earth, the world below the skies," as distinguished from heaven. Similar formation in German unterwelt, Dutch onderwereld, Danish underverden. Meaning "lower level of society" is first recorded 1890; "criminals and organized crime collectively" is attested from 1900.
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