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Definition of derailment noun from the Oxford Advanced Learner's Dictionary

derailment

noun
 
/diːˈreɪlmənt/
 
/diːˈreɪlmənt/
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  1. [countable, uncountable] an occasion when a train leaves the track; the act of causing this to happen
    • the derailment of a passenger train
    Topics Transport by bus and trainc2
  2. [uncountable] the fact of stopping a process from continuing in the way it was intended to
    • the derailment of the peace process
previously
adverb
 
 
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