a place with attractions that are considered sinful, such as gambling, prostitution, etc.; also, the state of taking part in such activities
On his 21st birthday, he'll be in sin city.
Did you dabble in a bit of liquid courage before your sin city dance scenes?
In Downtown Vegas, the codes of sin city are still intact—there are casinos, neon lights and nightlife.
But in sin city, and later as Randy "The Ram" in The Wrestler, Rourke came roaring back.