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derail

verb [I or T] (TRAIN)
 
 
/ˌdiːˈreɪl/

Definition

If a train derails or is derailed, it comes off the railway tracks.Accidents involving vehicles derailment
 
 
/-mənt/ noun [C or U]
There's been a derailment just outside Crewe, and many people are feared dead.Accidents involving vehicles
(Definition of derail verb (TRAIN) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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