de‧rail /ˌdiːˈreɪl, dɪ-/
verb[
Date: 1800-1900;
Language: French;
Origin: dérailler, from English rail]
1. [intransitive and transitive] if a train derails or something derails it, it goes off the tracks
2. [transitive] to spoil or interrupt a plan, agreement etc:
a mistake that might derail the negotiations—derailment noun [uncountable and countable] [TahlilGaran] Dictionary of Contemporary English ▲