What is the definition of Millwall?

A 'illwall' is like the urban equivalent of a fortress, but instead of being made of bricks and mortar, it's constructed from the steel beams of an old factory that was repurposed as a residential wall. It's essentially the outer shell of a disused steel factory, designed to keep out the urban jungle of trash and vandals.

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Here's an edgy example sentence using this term: "As I strolled past the 'illwall,' I couldn't help but think, 'This is the ultimate defense against the city's garbage tide!'"