(french) literally half world, the English equivalent would be underworld. It is important to note that the final e is not pronounced in accordance with rules of french pronunciation. Has a pretentious ring to it.
Person A: Hey do you want to tag along, me and a couple of friends are going to the club near the center that opened last year.
Person B: I rather not, I heard rumors that the owners have ties to the demimonde and that it is a hotbed for drug addicts.
Person B: I rather not, I heard rumors that the owners have ties to the demimonde and that it is a hotbed for drug addicts.
by Earl of Warwick August 27, 2017