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Rust Beltor rust belt
A heavily industrialized area containing older factories, particularly those that are marginally profitable or that have been closed.
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.
an area where heavy industry is in decline, esp in the Midwest of the US
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
(sometimes caps.) the Great Lakes states and adjacent areas of the eastern U.S. in which much of the work force has traditionally been employed in manufacturing and metals production.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.