derail

verb

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

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 employee.Joanne 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.
The burning husks of large trucks transporting fuel and derailed train cars were filmed and photographed by civilians and Ukrainian military drones, highlighting supply chain disruptions. Marc Santora, New York Times, 4 July 2026 The summer’s political bestseller portrays him as a figure whose transformative potential has been utterly derailed by hubris. Shelby Talcott, semafor.com, 3 July 2026 His relentless push for the measure has prompted him to derail a bipartisan housing bill and threaten to forgo signing any piece of legislation unless the voting measure is approved. Ana Ceballos follow, Los Angeles Times, 2 July 2026 Max Meyer’s bid to win his first 10 decisions for Miami this season was derailed by four unearned runs in the fourth. Miami Herald, 2 July 2026 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 5 Jul. 2026.

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

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

More from Merriam-Webster