box spring(redirected from box springs)
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A cloth-covered frame containing rows of coil springs, usually placed under a mattress for support.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Furniture) a coiled spring contained in a boxlike frame, used as a base for mattresses, chairs, etc
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
an upholstered bedspring composed of a number of helical springs, each in a cylindrical cloth pocket.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.