noun (sometimes initial capital letters)
the heavily industrial area of the northeastern U.S. containing the older industries and factories.
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Origin of rust belt
First recorded in 1980–85
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for rust belt
an area where heavy industry is in decline, esp in the Midwest of the US
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012