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 ?
A thrilling whodunit classic so intense you won't even have time to lose your train of thought.
Did you lose your train of thought? No problem--take a minute to collect your thoughts and let me ask you that question again.
It can save you if you lose your train of thought, keep your audience engaged and highlight your main points.
And putting it all down for them to read without interrupting you and making you lose your train of thought is the best way to do it but be sure you say everything you need to say and don't expect an answer from them on it.
If you stop dreaming you lose your train of thought.
The third person, ideally, is you (or the manager in charge of the order.) If you don't have to pick up a box or bottle every other minute, you're less likely to lose your train of thought as you're double-checking the shipment against the invoice.