derail

verb

de·​rail di-ˈrāl How to pronounce derail (audio)
dē-
derailed; derailing; derails

transitive verb

1
: to cause to run off the rails
2
a
: to obstruct the progress of : frustrate
security problems derailed the tour
b
: to upset the stability or composure of
divorce … can seriously derail an employeeJoanne Gordon

intransitive verb

: to leave the rails
derailment noun

Examples of derail in a Sentence

The train derailed in heavy snow. The train was derailed by heavy snow.
Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Research has shown that prolonged exposure to high-stress environments can lead to burnout, anxiety and depression, potentially derailing even the most capable leaders. Ginni Saraswati, Forbes, 26 Feb. 2025 Drinking Sugary Coffee Beverages Coffee loaded with cream, syrup, and toppings like brown butter or sprinkles can quickly derail your weight loss goals. Johna Burdeos, Health, 26 Feb. 2025 Four of the hostages handed over last week were also deceased, with what Hamas said was a mix-up in the identity of one abductee at one point threatening to derail the ceasefire. Tovah Lazaroff, NBC News, 26 Feb. 2025 If this is a career risk, ultimately—and maybe this is a privileged position—but if this somehow derails my career, then maybe this isn’t where I was meant to be. Meghan Bartels, Scientific American, 25 Feb. 2025 See All Example Sentences for derail

Word History

Etymology

French dérailler to throw off the track, from dé- de- + rail, from English

First Known Use

1850, in the meaning defined at transitive sense 1

Time Traveler
The first known use of derail was in 1850

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Cite this Entry

“Derail.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/derail. Accessed 3 Mar. 2025.

Kids Definition

derail

verb
de·​rail di-ˈrā(ə)l How to pronounce derail (audio)
: to cause to run off the rails
a train derailed by heavy snow
derailment noun

More from Merriam-Webster on derail

Last Updated: - Updated example sentences
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