box spring

noun
🔊/ˈbɒks sprɪŋ/
🔊/ˈbɑːks sprɪŋ/
[usually plural]
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  1. each of a set of metal springs inside a box that is covered with cloth and used under a mattress as part of a bed
    • For a firm bed, place a board between the mattress and the box springs.对于坚固的床,请将板子放在床垫和弹簧盒之间。