roller coaster Meaning in the Cambridge English Dictionary
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Meaning of “roller coaster” in the English Dictionary

"roller coaster" in British English

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roller coasternoun

uk   us  
[C] an ​excitingentertainment in an amusementpark, like a ​fasttrain that goes up and down very ​steepslopes and around very ​suddenbends [S] a ​situation which ​changes from one ​extreme to another, or in which a person's ​feelingschange from one ​extreme to another: He was on an ​emotionalrollercoaster for a while when he ​lost his ​job.
(Definition of roller coaster from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"roller coaster" in American English

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roller coasternoun [C]

 us   /ˈroʊ·lər ˌkoʊ·stər/ (plural roller coasters)
a ​smallrailroad, esp. in an amusement park , with ​opencars that ​travelquickly along a ​steep, ​curvedtrack 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)

"roller coaster" in Business English

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roller coasternoun [S]

uk   us  
a ​situation in which ​prices, ​rates, etc. ​keep going up and down by large ​amounts very quickly: Last week the roller ​coaster of ​crudeoilpricesclimbed to $89.47 on Thursday and $90 on Friday. Mortgage chaos ​sent the ​stockmarket on a roller ​coasterride.
(Definition of roller coaster from the Cambridge Business English Dictionary © Cambridge University Press)
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