suburban expansion. Term used in the Northeast US.
BoWash stands for the northeast corridor of cities in the U.S. BOston to WASHington D.C.. It is the most populated part of the U.S. and can be considered one large city. It is often called Megalopolis.
BosWash (also referred to as BoWash, BosNYwash, the Northeast Corridor, or simply the Northeast Megalopolis) is a group of metropolitan areas in the northeastern United States, extending from Boston, Massachusetts, to Washington, D.C., including Manchester, New Hampshire; Worcester, Massachusetts; Springfield, Massachusetts; Providence, Rhode Island; Bridgeport, Hartford, New Haven and Stamford, Connecticut; New York City; Camden, Jersey City and Newark, New Jersey; Philadelphia, Pennsylvania; Wilmington, Delaware; and Baltimore, Maryland. It ends in Virginia.