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roller coaster Definition

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roller coaster
noun(roll-er coast-er)
elevated railway in an amusement park (usually with sharp curves and steep inclines)
Synonyms: big dipper, chute-the-chute,
roller coaster
noun(roll-er coast-er)
anything characterized by abrupt and extreme changes (especially up and down)
Examples:
The economy has been on a roller coaster all year.

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