An urban area where homeless people congregate under makeshift shelters made from cardboard boxes.
 Example sentencesExamples
-  And that's when people stopped giving money to the lady, as she looked too well dressed to be residing in cardboard city.
 -  Remember cardboard city, and streets lined with beggars?
 -  We are thrilled to be getting rid of our cardboard city, it was an appalling situation for pupils and teachers.
 -  In the meantime, Sydney is becoming a cardboard city.