Translation guide
How to express that something is not following the intended path, plan, or topic in Japanese.
Describing a vehicle, person, or process that has strayed from its intended course.
Literally 'to deviate from the course'. Used for vehicles, races, or any planned route.
The car went off-track.
Means 'to go off the rails' or 'deviate from the track'. Often used for trains or metaphorical paths.
The train went off the tracks.
Specifically means 'to derail' (for trains) or 'to go off-topic' (for conversations).
The train derailed.
When a discussion or thought process goes off on a tangent.
The most common way to say a conversation has gone off-topic. '話' means 'talk/story', 'それる' means 'to deviate'.
We've gotten off-track.
Literally 'to deviate from the main subject'. More formal than 話がそれる.
The discussion is off-track.
Also used metaphorically for conversations going off-topic, like 'derailing'.
The meeting went off-track.
When a project, plan, or person is not on track to meet a goal or deadline.
Means 'the plan is behind schedule'. A straightforward way to say things are off-track.
The project is off-track.
Literally 'not progressing as scheduled'. A neutral way to indicate things are off-track.
When an assumption, calculation, or understanding is wrong.
Both mean 'to deviate', but それる is used more for abstract deviations (conversations, attention), while 外れる is used for physical or planned paths. 脱線する is specifically for derailing or going off-topic.
Avoid directly translating 'off-track' as オフトラック. It is not a natural Japanese expression. Use the phrases above depending on context.
The work is off-track.