derail

UK: dɪˈreɪl | US: dɪˈreɪl

Definition
  1. vt. 1. To cause (a train or tram) to leave its tracks accidentally.

  2. vt. 2. To divert or disrupt (a plan, process, or discussion) from its intended course.

  3. vi. 1. (Of a train) to leave the tracks.

Structure
de <off, away>rail <track>
Etymology

derail = de<off, away> + rail<track>

  • de: A prefix from Latin meaning "off" or "away," often indicating removal or reversal.
  • rail: Refers to the metal track on which trains run, derived from Old French reille (bar, rail), ultimately from Latin regula (straight stick, rule).

Etymology Origin:
The word derail emerged in the early 19th century, combining the prefix de- (suggesting deviation) with rail, reflecting the literal action of a train coming "off the tracks." By the mid-1800s, it gained figurative use, describing disruptions to plans or processes—mirroring the chaos of a train accident.

Examples
  1. The freight train derailed after hitting a fallen tree.

  2. Poor communication could derail the negotiation process.

  3. The politician’s scandal derailed his campaign.

  4. A small rock on the track might derail the toy train.

  5. The team worked hard to prevent the project from derailing.