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English definition of “derail”

derail

verb uk   /ˌdiːˈreɪl/ us  

derail verb (TRAIN)

[I or T] If a train derails or is derailed, it comes off the railway tracks.

derail verb (PLAN)

[T] to prevent a plan or process from succeeding: Renewed fighting threatens to derail the peace talks.
derailment
noun [C or U] uk   /-mənt/ us  
There's been a derailment just outside Crewe, and many people are feared dead.
(Definition of derail from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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