each of a set of vertical springs housed in a frame in a mattress or upholstered chair base.
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Definition of box spring
box springnoun
khung lò xo nâng nệm
The term "box spring" likely originated from the early design of the mattress support. These early springs were often encased in a wooden frame, resembling a box. The "spring" part refers to the coiled metal springs that were used to provide support and resilience. Over time, the design evolved, but the name "box spring" persisted, even though modern versions often use different materials like foam or steel.
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