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