[roh-ler-koh-ster, roh-li-]
verb (used without object)
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.
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.
of, pertaining to, or characteristic of a roller coaster.
resembling the progress of a ride on a roller coaster in sudden extreme changeableness.

1960–65 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To rollercoaster's 21st Century Lexicon
Main Entry:  rollercoaster
Part of Speech:  adj
Definition:  changing between good and bad; uncontrollable or unstable's 21st Century Lexicon
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Example sentences
The drawback is the emotional rollercoaster he rides.
The drama of the day adds to what has already been something of an emotional
Yet the rollercoaster life of the embattled singer proved more powerful than
  his musical gifts.
Tommy had this one crazy idea where he wanted to put his drums on a
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