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