roller-coaster

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Noun roller-coaster has 2 senses

roller coaster - anything characterized by abrupt and extreme changes (especially up and down); "the economy has been on a roller coaster all year"
--₁ is a kind of turbulence, upheaval, Sturm und Drang
roller coaster, big dipper, chute-the-chute - elevated railway in an amusement park (usually with sharp curves and steep inclines)
--₂ is a kind of elevated railway, elevated railroad, el, overhead railway; ride
--₂ has particulars: hypercoaster

rollback rolled-up rolled rolled biscuit rolled into one rolled oats rolled out rolledover roller-coaster roller-coasters roller-skate roller-skater roller roller bandage roller bearing roller bit roller blade

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