de·rail /ˌdiːˈreɪl, dɪ-/ verb 1. [intransitiveI, transitiveT]TTT if a train derails or something derails it, it goes off the tracks (使)〔火车〕出轨, (使)脱轨 2 [transitiveT]SPOIL to spoil or interrupt a plan, agreement etc 破坏,干扰〔计划、协议等〕 a mistake that might derail the negotiations 可能会扰乱谈判的失误
—derailment noun [countableC, uncountableU]