Definition of derail verb from the Oxford Advanced Learner's Dictionary

 

derail

 verb
verb
BrE BrE//dɪˈreɪl//
 
; NAmE NAmE//dɪˈreɪl//
 
[intransitive, transitive]Verb Forms present simple I / you / we / they derail
BrE BrE//dɪˈreɪl//
 
; NAmE NAmE//dɪˈreɪl//
 
he / she / it derails
BrE BrE//dɪˈreɪlz//
 
; NAmE NAmE//dɪˈreɪlz//
 
past simple derailed
BrE BrE//dɪˈreɪld//
 
; NAmE NAmE//dɪˈreɪld//
 
past participle derailed
BrE BrE//dɪˈreɪld//
 
; NAmE NAmE//dɪˈreɪld//
 
-ing form derailing
BrE BrE//dɪˈreɪlɪŋ//
 
; NAmE NAmE//dɪˈreɪlɪŋ//
 
Train and bus travel
 
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(of a train) to leave the track; to make a train do this The train derailed and plunged into the river. derail something (figurative) This latest incident could derail the peace process. It is claims of financial irregularities which could ultimately derail his campaign. The company’s plans were initially derailed by problems with licence agreements. See related entries: Train and bus travel Word Origin mid 19th cent.: from French dérailler, from dé- (expressing removal) + rail ‘rail’.
See the Oxford Advanced American Dictionary entry: derail