Longman Dictionary of Contemporary English homepage

Date: 1800-1900
Language: French
Origin: dérailler, from English rail

derail

verb
     
Related topics: Trains, Railways
de‧rail
1 [intransitive and transitive]TTT if a train derails or something derails it, it goes off the tracks
2 [transitive] to spoil or interrupt a plan, agreement etc:
a mistake that might derail the negotiations
derailment noun [uncountable and countable]

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