roller coaster, n.
elevated railway in an amusement park (usually with sharp curves and steep inclines)
<noun.artifact>
big dipper chute-the-chute roller coaster
semantic pointers
hypernym
hyponym
anything characterized by abrupt and extreme changes (especially up and down)
<noun.state>
roller coaster
sample sentences
"the economy has been on a roller coaster all year"
semantic pointers
hypernym