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.
While staying in a secure position during economic uncertainty makes sense, remaining paralyzed by fear can derail long-term career growth and personal fulfillment. Kara Dennison, Forbes.com, 16 Sep. 2025 At the time, many simulations would derail after running for a few weeks, as rounding errors at the grid points artificially amplified atmospheric waves. Zack Savitsky, Quanta Magazine, 15 Sep. 2025 Preseason predictions have been derailed in spectacular fashion and record time. David Ubben, New York Times, 15 Sep. 2025 After a now-infamous weather delay derailed a powerhouse clash at CPKC Stadium earlier this year, Saturday night’s matchup between the Kansas City Current and Washington Spirit provided a second bite at the apple. Daniel Sperry, Kansas City Star, 14 Sep. 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

Browse Nearby Words

Cite this Entry

“Derail.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/derail. Accessed 20 Sep. 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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