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Wiktionary
big box

n. A large self-service store, usually on a single level, with few interior walls, owned and run by a corporation

Wikipedia
Big Box

Usage examples of "big box".

Orabona and I went to the Surface for the big box, but when we had packed it we couldn't get It up the three flights of steps.

Orabona and I went to the surface for the big box, but when we had packed it we couldn't get It up the three flights of steps.