derailment
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話が脱線したので本題に戻ろう。
The conversation went off track, so let’s return to the main topic.
会議で何度も脱線して時間が足りなくなった。
We went off topic many times in the meeting and ran out of time.
電車が脱線する事故は非常に危険だ。
An accident in which a train derails is extremely dangerous.