Definition of roller coaster noun from the Oxford Advanced Learner's Dictionary


    roller coaster

    BrE BrE//ˈrəʊlə kəʊstə(r)//
    ; NAmE NAmE//ˈroʊlər koʊstər//
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  1. 1a track at a fairground that goes up and down very steep slopes and that people ride on in a small train for fun and excitement a roller-coaster ride
  2. 2a situation that keeps changing very quickly The last few weeks have been a real roller coaster. an emotional roller coaster
See the Oxford Advanced American Dictionary entry: roller coaster