Simple Definition of box spring

from our Learner's Dictionary

box spring

noun

plural box springs
US : a wide, flat box that is filled with metal springs and covered with cloth and that is put under a mattress for support

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“Box spring.” Merriam-Webster.com Simple Definition, Merriam-Webster, https://www.merriam-webster.com/simple/box%20spring. Accessed 24 Jun. 2026.

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