red-light district
US /ˈrɛdˌlaɪt ˈdɪstrɪkt/
UK /ˈrɛdˌlaɪt ˈdɪstrɪkt/
1.
an area of a town or city containing many brothels, strip clubs, and other sex-oriented businesses
:
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The old port area used to be a notorious red-light district.
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Tourists are often warned to avoid the city's red-light district at night.