Rollercoaster (noun)

1. An amusement ride consisting of a railway with steep inclines and descents that twists and turns, often featuring sudden drops and tight curves.
2. Something, such as an experience or event, that is characterized by extreme ups and downs.

Origin:

Early 20th century: blend of roller and coaster.

Examples:

1. The rollercoaster was a popular attraction at the amusement park.
2. The stock market was on a rollercoaster ride.
3. The rollercoaster ride was a thrilling experience.
4. The relationship was like a rollercoaster, with its ups and downs.
5. The rollercoaster was a favorite among thrill-seekers.