derail

verb

de·​rail di-ˈrāl 

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 employee.

—Joanne Gordon

intransitive verb

: to leave the rails

derailment

di-ˈrāl-mənt 

dē-

noun

Synonyms of derail

• distract
• disturb
• bother
• worry
• alarm
• concern
• unsettle
• agitate
• anger

Examples of derail in a Sentence

The train derailed in heavy snow.

The train was derailed by heavy snow.

Recent Examples on the Web

If successful, the effort can reshape the boardroom, influence strategy, and in some cases derail or redirect major transactions. —Corey Martin, Forbes.com, 21 Jan. 2026

Córdoba, Spain — A commuter passenger train derailed in Gelida, near the Spanish city of Barcelona on Tuesday, killing the driver and injuring 37 people, a spokesperson for the regional government of Catalonia told CNN. —Pau Mosquera, CNN Money, 21 Jan. 2026

The collision took place late Sunday when a high-speed train operated by rail company Iryo, travelling from Malaga to Madrid, derailed near Adamuz in the southern Andalusia region. —CBS News, 20 Jan. 2026

Via Instagram Stories, Beckham shared the couple's April 2022 wedding fueled his split from his family, saying the day left bad memories for him and his wife after his family allegedly derailed it. —Nicole Fallert, USA Today, 20 Jan. 2026

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

Rhymes for derail

• airmail
• assail
• avail
• bewail
• blackmail
• cattail
• cocktail
• curtail
• detail
• dovetail
• email
• entail

Kids Definition

derail

verb

de·​rail di-ˈrā(ə)l 

: to cause to run off the rails

a train derailed by heavy snow

derailment

-mənt 

noun