roll·er-coast·er
ˈrō-lər-ˌkō-stər
ˈrō-lə-ˌkō-
: marked by numerous ups and downs
an entertainer's roller-coaster career
roll·er coast·er
ˈrō-lər-ˌkō-stər
ˈrō-lē-ˌkō-
1
: an elevated railway (as in an amusement park) constructed with sharp curves and steep inclines on which cars roll
2
: something resembling a roller coaster
especially
: behavior, events, or experiences characterized by sudden and extreme changes
an emotional roller coaster
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Merriam-Webster unabridged
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