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I am an ESL learning and I use the idiom "I lost my train of thought" quite often. Recently, I think that it is sort of redundant to use it several times when I talk to my friends.

I am curious that is there any similar idiom or phrase that mean like "I lost my train of thought"?

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I lost my chain of thought. –  Blessed Geek Dec 3 '12 at 16:38
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Note: redundant does not mean repetitive. It means superfluous. –  MετάEd Dec 3 '12 at 16:39
    
"Sorry, I forgot what I was saying." –  J.R. Dec 3 '12 at 17:17
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You can say "Where was I?" –  Armen Ծիրունյան Dec 3 '12 at 19:50
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closed as off topic by tchrist, MετάEd, J.R., Daniel, Cameron Dec 3 '12 at 21:42

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6 Answers

up vote 6 down vote accepted

If you want something a native would actually use:

I'm sorry, I'm miles away.

My mind's gone blank.

I'm just not with it today.

Could you run that past me again?

Pardon?

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If you're talking to your friends, you can say, "I forgot where I was going with that," or, if they are casual like mine are, I would just ask, "What was I saying?"

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Super casual and a bit vulgar, "Brain fart!"

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  • I lost my chain of thought
  • I lost my chain of reasoning on the subject
  • My thought process is disrupted
  • My sequence of thought is disrupted
  • My sequence of reasoning has abended
  • My sequence of reasoning for the subject has faded
  • My reasoning encountered a null pointer exception on the subject
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Please provide reliable sources for your answer. I'm going to guess that the "abended" and "null pointer exception" suggestions, at least, are not idiomatic expressions. –  MετάEd Dec 3 '12 at 16:47
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How about:

  • It slipped my mind.
  • Got lost in the trip down memory lane.
  • I've got a brain like a sieve these days.
  • Fell off the thought bandwagon.
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