Debacle (noun)

1. A sudden and complete failure, especially of a plan or undertaking.
2. A sudden and overwhelming defeat or disaster.

Origin:

From french débâcle, meaning a sudden and complete failure.

Examples:

1. The company's new product launch turned into a debacle.
2. The election campaign was a debacle for the party.
3. The football team's performance in the final was a debacle.
4. The project turned into a debacle due to lack of planning.
5. The concert was a debacle due to technical difficulties.