n. the southern U.S. states, where it is generally warm and sunny. (See also rust belt.) : I want to retire to the sun belt.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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The southern and southwestern United States, as in Retirees have been moving to the sun belt for years. It is so called for its warm climate. [Mid-1900s]
