Derail (verb)

1. To cause a train or other vehicle to come off the tracks.
2. To cause a plan or process to fail or be disrupted.

Origin:

From french dérailler, from dé- + railler to rail.

Examples:

1. The train was derailed in a collision with a truck.
2. The derailment caused several injuries and delays.
3. His plans were derailed by the unexpected news.
4. The meeting was derailed by a heated argument.
5. The project was derailed by budget cuts.