the part of a city where many people offer sex for money.
A prostitute was found murdered in the city's red-light district last night.
red-light district
An area in a city containing brothels and other businesses related to activities that are typically illegal elsewhere. If you patronize the red-light district, you're essentially subsidizing the sex trade.
the red-ˈlight district
the part of a city where prostitutes work and sex shops are found: I got lost and found myself in the red-light district all alone!