Fig. the industrial north of the United States. (Patterned on sun belt.) The economy in the rust belt is slowing down. The salt they put on the roads in the winter made my car all rusty. I guess that's why they call this area the rust belt.
n. the industrial north of the U.S. (Patterned on sun belt.) The salt they put on the roads in the winter made my car all rusty. I guess that’s why they call this area the rust belt.