American English

Definition of roller coaster noun from the Oxford Advanced American Dictionary

     

    roller coaster

     noun
    noun
     
     
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  1. 1 a track at a fairground or an amusement park 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 Learner's Dictionary entry: roller coaster