derail
verb uk/ˌdiːˈreɪl/ us/ˌdiːˈreɪl/
(TRAIN)
[ I or T ]（使）（火车）脱轨
If a train derails or is derailed, it comes off the railway tracks.
(PLAN)
[ T ]阻挠
to prevent a plan or process from succeeding
Renewed fighting threatens to derail the peace talks. 重燃的战火对和谈构成了威胁。