switchback

noun
1
a road or railway track that has many sharp bends as it goes up a steep hill, or one that rises and falls steeply many times
جاده مارپیچ, راه پرپیچ‌وخم, مسیر پرپیچ‌وخم, جاده زیگزاگ
2
a 180 degree bend in a road that is going up a steep hill
پیچ ۱۸۰ درجه, پیچ سرگونی, پیچ برگردان, پیچ بازگشت
synonym hairpin bend
3
a roller coaster(= a track at a fairground that goes up and down very steep slopes and that people ride on in a small train for fun and excitement)
ترن هوایی, ترن شهربازی, ریل شهربازی