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 ?
In a third, she appeared momentarily dazed and confused, and lost her train of thought. Reportedly, she has a volcanic temper.
For most of the three-hour debate, she paused in the middle of sentences, appearing to have lost her train of thought. Called on to expound on her answer, Santiago stood on the podium but did not speak for several moments.
IT was like a scene from Laurel and Hardy when a confused clown lost her train of thought.
At one point midway into the debate, she lost her train of thought completely and asked the host to repeat the question.