Downfall (noun)

1. A sudden and severe or catastrophic loss of success, status, or power.
2. A decline or deterioration, especially in health or morale.

Origin:

Late 16th century, from down + fall.

Examples:

1. The company's downfall was attributed to mismanagement and lack of investment in new technology.
2. The athlete's downfall was the result of repeated injuries and a string of poor performances.
3. The empire's downfall was hastened by internal corruption and external invasion.
4. The politician's downfall was due to a scandal involving unethical behavior.
5. The stock market's downfall was a result of global economic instability and declining confidence in the financial sector.