- roller coaster - anything characterized by abrupt and extreme changes (especially up and down); "the economy has been on a roller coaster all year"
--1 is a kind of turbulence, upheaval, Sturm und Drang
- roller coaster, big dipper, chute-the-chute - elevated railway in an amusement park (usually with sharp curves and steep inclines)
--2 is a kind of elevated railway, elevated railroad, el, overhead railway; ride
--2 has particulars: hypercoaster - roller coaster, big dipper, chute-the-chute - elevated railway in an amusement park (usually with sharp curves and steep inclines)