switchbacks

/S W IH1 CH B AE0 K S/
noun
  1. 1

    A zigzag path, road or railway track; especially a railway track in which the train travels in a reverse direction at each switch

  2. 2

    A hairpin bend.

  3. 3

    A roller coaster.

  4. 4

    A route with alternate sharp ascents and descents.

Source: https://en.wiktionary.org/wiki/switchback, https://en.wiktionary.org/wiki/switchbacks