A roller coaster is the fast twisting ride of climbs, drops and screams. Ride the roller coaster, a wooden roller coaster, a roller coaster of emotions.
After the first climb it runs on gravity alone, which is why the first hill is always the highest. The figurative use is common, and a roller coaster of a week is one of violent ups and downs.
1nounroller coasterThe fast twisting ride of climbs, drops, and screams.
“The kids screamed all the way down the first big drop of the roller coaster.”
roller coaster is a ride.
Also accepted in games: rollercoaster
rollercoaster A univerbation of roller coaster, after the rolling and coasting motions to which the riders are subjected.
Etymology from Wiktionary, CC BY-SA
Practised in In the City, Circus & Fairground