"Rhenish fan" meaning in English

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  "etymology_text": "Calque of German Rheinischer Fächer. So called because all or most of the isoglosses collapse in Hesse and fan out to the west.",
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        "A set of isoglosses in West Central German showing how the effect of the High German consonant shift gradually decreases towards the north-west (i.e. towards Low Franconian)"
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      "id": "en-Rhenish_fan-en-name-i2xyznYN",
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        "(linguistics) A set of isoglosses in West Central German showing how the effect of the High German consonant shift gradually decreases towards the north-west (i.e. towards Low Franconian)"
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        {
          "word": "Rhenish Fan"
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  "word": "Rhenish fan"
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