demi-monde
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A French term meaning 'half-world,' referring to a class of people on the fringes of respectable society, often associated with dubious or illicit activities.
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Mentioned once in A Word To The Wiseguy.
A Word To The Wiseguy
Season 3 · Episode 15 · S03E15
“it is not entirely unpleasant to rub shoulders with the demi-monde.”