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 ?
Players lose their train of thought. The intensity goes.
Co-directors Ash Brannon and Chris Buck revel in the hilarious to-camera interviews as characters lose their train of thought while waxing lyrical about the joys of surfing and hardships of Antarctic life.
Many worry that they will lose their train of thought and also that they will be unable to answer questions.
The problem was that I had just had highlights and lowlights put in my hair--which cost hundreds of dollars...." For some reason, they never seem to lose their train of thought and just shut up.
Providing such intensity of instruction is particularly appropriate with a scrolling screen and hypertext links through which students may easily lose their train of thought or have difficulty remembering exactly what distinguishes a scholarly journal from a popular magazine.