What does it mean by a roller-coaster ride as an idiom?

The idiom "roller coaster ride" is a metaphor used to describe a situation or experience that involves dramatic ups and downs, twists, and turns, just like the ups, downs, and twists of a roller coaster ride. It is often used to describe a series of events, emotions, or circumstances that are unpredictable, exciting, and sometimes even frightening.

Here are some examples of the idiom "roller-coaster ride" in use:

1. "The stock market has been a roller-coaster ride this year, with wild fluctuations in prices."

2. "Their relationship has been a roller-coaster ride, with highs of intense passion and lows of deep despair."

3. "The project has been a roller-coaster ride, with unexpected challenges and setbacks, but also moments of great triumph."

4. "My career has been a roller-coaster ride, with periods of success and recognition followed by periods of struggle and uncertainty."

5. "Life is often a roller-coaster ride, filled with moments of joy and excitement as well as moments of sadness and disappointment."

6. "The journey to recovery was a roller-coaster ride, with setbacks and relapses, but ultimately ending in triumph."

By using the metaphor of a roller coaster, this idiom vividly captures the unpredictable nature and emotional intensity of certain experiences, where the ups and downs are both thrilling and challenging, leaving a lasting impact on the individual involved.