lose (one's) train of thought

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lose (one's) train of thought

To be unable to resume one's previous progression of thought. A: "Therefore, it is critical to remember that—" B: "Professor! Will this be on the final exam?" A: "Yes, Stephen. Shoot, now I've lost my train of thought." And so you see, by collecting such data, we can make an inference to the, um… the… What am I trying to say? I lost my train of thought.
See also: lose, of, thought, train

lose one's train of thought

Fig. to forget what one was talking or thinking about. Excuse me, I lost my train of thought. What was I talking about? Your question made the speaker lose her train of thought.
See also: lose, of, thought, train
References in periodicals archive ?
Every time I stopped to deal with this one student, 20 kids lost their train of thought. Some children in that class had to really struggle to focus on their work.
But he thought his side's crucial opening goal came after Rangers lost their train of thought after an injury to keeper Stefan Klos.