Pronunciation: /ˈswɪtʃbak/
noun
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1British a road, path, or railway with alternate sharp ascents and descents: the path was a switchback of hills and wooded dales [as modifier]: it is a switchback journey with many ups and downs
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a roller coaster.
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2North American a 180° bend in a road or path, especially one leading up the side of a mountain: the trail soon leads robustly straight up, with few switchbacks [as modifier]: a switchback road