- a highway, as in a mountainous area, having many hairpin curves.
- a zigzag track arrangement for climbing a steep grade.
- roller coaster.
- (of a road, railroad track, etc.) to progress through a series of hairpin curves; zigzag: The road switchbacks up the mountain.
- a mountain road, railway, or track which rises and falls sharply many times or a sharp rise and fall on such a road, railway, or track
- another word (esp Brit) for big dipper
