rollercoaster

Etymology

Univerbation of roller coaster, after the rolling and coasting motions to which the riders are subjected.

noun

1. An amusement ride consisting of a buggy on a track that rises, falls, twists and turns.
2. (figurative, by extension) Any situation in which there are ups and downs, or violent changes.
   Our relationship was quite a rollercoaster. Finally, I had enough of it and left her.
   The stock market has been quite the rollercoaster in the last few weeks.
   Morgan's men reversed their fortunes and swept into the final with three successive victories, including a memorable semi-final demolition of Australia. In the final, the rollercoaster continued, only for the heroics of Stokes to leave England as worthy champions, matching the achievement of the England women's team on the same ground two years ago. 14 July 2019, Stephan Shemilt, “England win Cricket World Cup: Ben Stokes stars in dramatic finale against New Zealand”, in BBC Sport, London