Relegate

relegate \REL-uh-gayt\, transitive verb:
1. To assign to an inferior position, place, or condition.
2. To assign to an appropriate category or class.
3. To assign or refer (a matter or task, for example) to another for appropriate action.
4. To send into exile; to banish.

The EPA, meanwhile, has been developing new rules that essentially would relegate agricultural runoff to the same category as pollution from concentrated sources such as factories and sewage plants.
-- John Lancaster, "For Big Hog Farms, Big Subsidies", Washington Post, August 17, 2001