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English definition of “roller coaster”

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roller coaster

noun uk   us  
[C] an exciting entertainment in an amusement park, like a fast train that goes up and down very steep slopes and around very sudden bends [S] a situation which changes from one extreme to another, or in which a person's feelings change from one extreme to another: He was on an emotional roller coaster for a while when he lost his job.
(Definition of roller coaster from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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