It's really a quite meaningless additive, sometimes carrying the idea of "at that time". It is more common in some regions and ethnic groups in the US than in others. You will hear it quite often in the movie "Fargo", for example.
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ESLBeginnerImeet with aran across this sentence: "I was concerned for a minute there". I don't understand whatdoes"there" means here. Is it "about it" ? Would someone please answer this question?