Pronunciation: (swich'bak"), [key]
1. a highway, as in a mountainous area, having many hairpin curves.
2. Railroads.a zigzag track arrangement for climbing a steep grade.
3. Brit.See roller coaster.
(of a road, railroad track, etc.) to progress through a series of hairpin curves; zigzag: The road switchbacks up the mountain.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.