Definitions from Wiktionary ( )

▸ noun:  (rail transport)
▸ noun:  A railway track on a steep slope in a zigzag formation, in which a train travels in a reverse direction at each switch.
▸ noun:  A railway track on which there are steep ascents and descents, a train moving partially or fully by the force of gravity using the momentum generated when descending to travel up an ascending part of the track; especially (British, dated), such a track built for fun rides at an amusement park; a type of rollercoaster.
▸ noun:  (by extension)
▸ noun:  (aviation) A flight path consisting of a series of steep ascents and descents, generally flown as a stunt.
▸ noun:  (chiefly British) A path or road having a series of steep ascents and descents.
▸ noun:  (chiefly Canada, US, road transport) A sharp bend in a path or road which causes a traveller to almost reverse their direction of travel, especially one of a series of such bends on an incline; a hairpin bend; also a path or road having such a series of bends.
▸ verb:  (intransitive) To take a zigzag course or path.

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