American English

Definition of derail verb from the Oxford Advanced American Dictionary



    [intransitive, transitive]Verb Forms present simple I / you / we / they derail
    he / she / it derails
    past simple derailed
    -ing form derailing
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  1. 1(of a train) to leave the track; to make a train do this The train derailed and plunged into the river. derail something
  2. 2(figurative) This latest incident could derail the peace process.
noun [countable, uncountable]
See the Oxford Advanced Learner's Dictionary entry: derail