get off the track
偏离正题，开始谈论与主题无关的内容
口语·表示偏离话题
英文释义
to deviate from the main topic or purpose; to lose focus or direction in a conversation or task
例句
We were discussing the budget, but then we got off the track and talked about vacations.
典故来源
源自火车脱轨的比喻，19世纪起用于指谈话或思维偏离主题。