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roller coaster

Noun roller coaster has 2 senses
  1. 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
  2. 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
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