The phrase "overcrowded cities" refers to cities that have too many people living in them, which can lead to limited space, increased traffic, and various problems with infrastructure and public services. Full definition
These participants addressed homelessness, housing inequities and other issues facing tenants in overcrowded cities such as — but not restricted to — New York. (artfcity.com)
Every year, Main Line Animal Rescue assists hundreds of dogs, cats, and rabbits transferred to our facility from overcrowded city shelters. (charitynavigator.org)
Immigrants were pouring into America by the millions and settling in already overcrowded city shuns. (religion-online.org)