Derail

To cause a train or other vehicle to leave the tracks accidentally. More broadly, to cause something to go off track or fail; to disrupt or impede the progress of a plan, process, or activity, often leading to its downfall or failure. It suggests a sudden or unexpected shift from a previously established course, creating a deviation or complete breakdown. Figuratively, it can refer to the loss of control or focus in personal or professional contexts, leading to unintended negative outcomes.

Derail meaning with examples

• The investigation revealed that a faulty switch had caused the train to derail, resulting in a significant disruption to the railway network and delayed numerous passenger journeys. Emergency crews were quickly dispatched to begin clearing the wreckage and repairing the damaged tracks, causing further delays. The incident brought into question the safety protocols of the railway.
• The constant infighting and leaked information began to derail the project; deadlines were missed and key personnel were left frustrated. The team's lack of focus and poor communication was impacting the ability to collaborate effectively. Despite efforts to repair the situation, the issues proved too difficult to overcome.
• His addiction began to derail his once-promising career. The pressure to perform combined with the addiction became too difficult for him to overcome, with consequences that impacted his job, relationships, and personal well-being. He lost his job, his friends, and his apartment as he battled against his addiction.
• The unexpected illness of the key speaker threatened to derail the entire conference schedule. To prevent a total collapse, organizers scrambled to find a replacement and adjust the agenda. Although many were disappointed by the original cancellation, the conference was salvaged with a reshuffle of topics.