ಅರ್ಥ : Anything characterized by abrupt and extreme changes (especially up and down).
ಉದಾಹರಣೆ :
The economy has been on a roller coaster all year.
ಅರ್ಥ : Elevated railway in an amusement park (usually with sharp curves and steep inclines).
ಸಮಾನಾರ್ಥಕ : big dipper, chute-the-chute