What Does It Mean When a Place Is Crushed?

When i think of e when i think of world building, i'm often an ancliches. I often force myself to question the the boundary states that i've created around given terms. Like any example i'll use here, what does it mean when a place is crowded? My house has, i think, 25 hundred square feet, and there's five people living in it. And there are people who would say that that's crowded. But i've spent some time reading up on and looking at pictures of a cowloon free city which was literally one of the most crowded places on earth. It was essentially a 60 thousand people, or forty thousand people, living in a space