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derailment

American  
[dee-rayl-muhnt] / diˈreɪl mənt /

noun

  1. the act or process of derailing.

  2. Psychiatry. loosening of associations.


Etymology

Origin of derailment

1940–45; derail + -ment, or < French déraillement


Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

See Examples For:

With the death toll still provisional, the crash is Spain's deadliest rail disaster since a derailment near Santiago de Compostela in the northwest killed 80 people in 2013.

From Barron's ● Oct. 29, 2026

There was a serious derailment near Lewes, East Sussex, and another smaller-scale incident near Wickford in Essex soon after.

From BBC ● Oct. 12, 2026

Dixon was deployed to the town two days after the derailment and remained for nearly three months.

From The Wall Street Journal ● Sep. 23, 2026

According to the spokesperson, the train will only be lifted off the line once the public prosecutor allows it, with investigations into the cause of the derailment still ongoing.

From Barron's ● Sep. 12, 2026

Chances are his train was late, because in 1984 there was a fire somewhere on the New York system every day and a derailment every other week.

From "The Tipping Point" by Malcolm Gladwell

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