Как по Английски будет сойти с рельсов

verb

Cause (a train or tram) to leave its tracks accidentally.

Примеры использования:

A train was derailed after it collided with a herd of cattle

phrase

Begin behaving in an uncontrolled or unacceptable way.

Примеры использования:

Sport saved them from going off the rails as youngsters

idiom

To start behaving in a way that is not generally acceptable, especially dishonestly or illegally

Примеры использования:

He went off the rails in his first year at university.