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

There are a lot of issues with this Eagles team, and injuries could derail things. — Jeff Howe, New York Times, 4 Oct. 2026

The Horned Frogs committed 11 penalties in both games against North Carolina and UCF, including multiple unnecessary roughness penalties and holding calls that derailed drives. — Steven Johnson, Fort Worth Star-Telegram, 2 Oct. 2026

As Vanderslice unwittingly contributed to the story with some quotes, not realizing the tone and direction of the article, his candidacy was derailed and his credibility ruined. — Jeffrey Sonnenfeld, Fortune, 1 Oct. 2026

Adding sweeteners, Ellison eventually convinced the Warner board to agree to a combination, derailing a WBD-Netflix deal. — Dominic Patten, Deadline, 30 Sep. 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