n.

1. 铁路爬陡坡的Z形转向路线，Z字形的山路
2. 【英】云霄飞车，环行滑车

vi.

1. 【铁】蜿蜒而行

n.

1. Brit. a road, railway, etc. with alternate sharp ascents and descents.
   ▸a roller coaster.
2. N. Amer. a hairpin bend.