box spring
noun
Definition of box spring
: a bedspring that consists of spiral springs attached to a foundation and enclosed in a cloth-covered frame
From the M-W Editors
First Known Use of box spring
1865
BOX SPRING Defined for English Language Learners
box spring
noun
Definition of box spring for English Language Learners
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: 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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