Definition of main streets:
(n) :
The generic street name (and often the official name) of the primary retail street of a village, town, or small city in the United States, Canada, Ireland, some parts of Scotland and also in some countries in central Europe.
(n) :
(idiomatic, Canada, US, collective) Everyday working-class people and small business owners, especially with regard to their concerns, social views, etc.
(n) :
The principal street, or one of the several principal streets, of a town.