roller coaster

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• March 2. 2016 from wordnet.princeton.edu

  roller coaster — noun — english

  anything characterized by abrupt and extreme changes (especially up and down); "the economy has been on a roller coaster all year"

• March 2. 2016 from wordnet.princeton.edu

  roller coaster — noun — english

  elevated railway in an amusement park (usually with sharp curves and steep inclines)