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English definition of “roller coaster”

roller coaster

noun [C]    /ˈroʊ·lər ˌkoʊ·stər/ (plural roller coasters)
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 noun from the Cambridge Academic Content Dictionary © Cambridge University Press)
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