derail - definition and synonyms

verb 

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/diːˈreɪl/
present tense
I/you/we/theyderail
he/she/itderails
present participlederailing
past tensederailed
past participlederailed
  1. 1
    [transitive] to make a train come off its rails
    1. a.
      [intransitive] if a train derails, it comes off its rails
  2. 2
    [transitive] mainly journalism to prevent something from continuing in the way that it was planned

    Disagreements between the two parties have derailed peace talks.

derived word

derailment

noun [countable/uncountable]
singularderailment
pluralderailments