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derail

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verb derail pronunciation in British English /diːˈreɪl/ 
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present tense
I/you/we/theyderail
he/she/itderails
present participlederailing
past tensederailed
past participlederailed
  1. 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]
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singularderailment
pluralderailments

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