Definition of big box noun from the Oxford Advanced Learner's Dictionary

 

big box

 
(also big-box store noun
BrE
 
; NAmE
 
)
BrE
 
; NAmE
 
(North American English, informal)
 
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a very large shop/store, built on one level and located outside a town, which sells goods at low prices When a big-box store opens, smaller retailers often go out of business. Efforts were made to limit big-box expansion.
See the Oxford Advanced American Dictionary entry: big box