switchback

American  

[swich-bak] / ˈswɪtʃˌbæk /

noun

1. a highway, as in a mountainous area, having many hairpin curves.

2. Railroads. a zigzag track arrangement for climbing a steep grade.

3. British. roller coaster.

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verb (used without object)

1. (of a road, railroad track, etc.) to progress through a series of hairpin curves; zigzag.

   The road switchbacks up the mountain.

switchback British  

/ ˈswɪtʃˌbæk /

noun

1. 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

2. another word (esp Brit) for big dipper

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Etymology

Origin of switchback

An Americanism dating back to 1860–65; switch + back ²