big dipper
From Longman Dictionary of Contemporary EnglishRelated topics: Outdoorbig dipperˌbig ˈdipper noun [countable] 1 DLO British English old-fashioned a small railway in a funfair, with steep slopes and sharp curves to give an exciting ride2 → the Big DipperExamples from the Corpusbig dipper• The descent, like a big dipper, is exhilarating but perfectly safe.