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Definition of derail

derail

/dɪˈreɪl/
de · rail

Plural:derails
•
Adjective:derailed
•
Past Simple:derailed
•
Past Participle:derailed
•
Present Participle:derailing
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derail Lexical Profile

derail Game Scores & Validity

• verb

1

To obstruct, divert, or ruin the normal progress of a plan, negotiation, career, or process.

Example

"An unexpected budget cut threatened to derail the entire research project before it could begin."


2

To cause a train, streetcar, or other rail vehicle to leave its tracks accidentally or intentionally, or to run off the rails.

Example

"Heavy snowfall and ice on the mountain pass caused the freight train to derail."

Synonyms
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Antonyms
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• noun

1

A mechanical safety device attached to a railway track designed to guide unauthorized or runaway rolling stock off the rails to prevent collisions.

Example

"The yard crew installed a portable derail on the siding to protect the maintenance workers."

• Rhymes for derail

Word Origin & Etymology

Borrowed in the mid-19th century from French dérailler, formed from the prefix dé- ('off') and rail ('railway track'), which was itself borrowed from English rail.

Cite this Entry


Wordmom. (2026). Definition of Derail. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/derail
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