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derailment

American  
[dee-reyl-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.

Mr. Vance co-sponsored the bill with then Democratic Sen. Sherrod Brown after Norfolk Southern’s destructive derailment in East Palestine, Ohio, in 2023.

From The Wall Street Journal • May 17, 2026

It is not clear what caused the derailment, although media reports suggested the tram had taken a sharp corner too quickly, as it turned out of Vittorio Veneto street.

From BBC • Feb. 27, 2026

Rail journeys on Southern, Thameslink and the Gatwick Express remain severely disrupted following an early morning derailment and a signal failure in south-east London.

From BBC • Feb. 4, 2026

Stripping out certain one-time items, such as expenses related to its tie-up with Union Pacific and continued costs from its freight-train derailment in Ohio, earnings were $3.22 a share.

From The Wall Street Journal • Jan. 29, 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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