/roh"leuhr koh'steuhr, roh"li-/ , v.i.
1. to go up and down like a roller coaster; rise and fall: a narrow road roller-coastering around the mountain; a light boat roller-coastering over the waves.
2. to experience a period of prosperity, happiness, security, or the like, followed by a contrasting period of economic depression, despair, or the like: The economy was roller-coastering throughout most of the decade.
adj.
3. of, pertaining to, or characteristic of a roller coaster.
4. resembling the progress of a ride on a roller coaster in sudden extreme changeableness.
[ 1960-65 ]