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roller coaster

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noun [countable] roller coaster pronunciation in British English 
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singularroller coaster
pluralroller coasters
  1. 2
    a situation in which there are many big and sudden changes

    Share prices have been on a roller coaster these last few days.

    an emotional roller coaster

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chicken raffle

any random process, such as a competition in which a name is drawn from a hat

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