RhymeZone: switchback definitions

Definitions of switchback:

noun: A zigzag path, road or railway track; especially a railway track in which the train travels in a reverse direction at each switch
noun: A hairpin bend.
noun: (dated, UK) A roller coaster.
noun: (UK) A route with alternate sharp ascents and descents.
verb: (of a path etc) To zigzag.

(Definitions from Wiktionary)