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English definition of “roller coaster”

roller coaster

noun [C]  /ˈroʊ·lər ˌkoʊ·stər/ (plural roller coasters) us  
a small railroad, esp. in an amusement park, with open cars that travel quickly along a steep, curved track that goes up and down over and over A roller coaster is also a feeling, situation, or experience that changes very quickly: an emotional roller coaster
(Definition of roller coaster from the Cambridge Academic Content Dictionary © Cambridge University Press)
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