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 ?
If I lose my train of thought midway through a sentence, I'm scared.
"Sometimes I lose my train of thought. Geez, do I have it?
APOLOGIES if I lose my train of thought, but I'm writing this week's column while facing challenges on two fronts.
I might become irrational and lose my train of thought and look foolish in the eyes of others.
Caught up in a deep-seated fear of making presentations, when delivering sales pitches to potential customers, "I'd get so flustered that I'd sometimes lose my train of thought or wouldn't answer their questions effectively," Hughes says.
Sometimes I'd spend a couple of hours on one track, then completely lose my train of thought and go off on another tangent."