"middle reaches" meaning in English

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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
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          "kind": "other",
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      ],
      "glosses": [
        "The middle portion of something."
      ],
      "id": "en-middle_reaches-en-noun-v6CPF2Ic",
      "related": [
        {
          "word": "upper reaches"
        },
        {
          "word": "lower reaches"
        }
      ],
      "tags": [
        "uncountable"
      ],
      "translations": [
        {
          "code": "cmn",
          "lang": "Chinese Mandarin",
          "roman": "zhōngyóu",
          "sense": "the middle portion of a river",
          "word": "中游"
        },
        {
          "code": "cmn",
          "lang": "Chinese Mandarin",
          "roman": "zhōngliú",
          "sense": "the middle portion of a river",
          "word": "中流"
        },
        {
          "code": "fi",
          "lang": "Finnish",
          "sense": "the middle portion of a river",
          "word": "keskijuoksu"
        },
        {
          "code": "de",
          "lang": "German",
          "sense": "the middle portion of a river",
          "tags": [
            "masculine"
          ],
          "word": "Mittellauf"
        },
        {
          "code": "hu",
          "lang": "Hungarian",
          "sense": "the middle portion of a river",
          "word": "középső szakasz/folyás"
        },
        {
          "code": "hu",
          "lang": "Hungarian",
          "sense": "the middle portion of a river",
          "tags": [
            "figuratively"
          ],
          "word": "középső szint"
        },
        {
          "alt": "ちゅうりゅう",
          "code": "ja",
          "lang": "Japanese",
          "roman": "chūryū",
          "sense": "the middle portion of a river",
          "word": "中流"
        },
        {
          "code": "ko",
          "lang": "Korean",
          "roman": "jungnyu",
          "sense": "the middle portion of a river",
          "word": "중류"
        },
        {
          "code": "vi",
          "lang": "Vietnamese",
          "sense": "the middle portion of a river",
          "word": "trung lưu"
        }
      ]
    }
  ],
  "word": "middle reaches"
}

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      "expansion": "middle reaches (uncountable)",
      "name": "en-noun"
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "upper reaches"
    },
    {
      "word": "lower reaches"
    }
  ],
  "senses": [
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      "glosses": [
        "The middle portion of something."
      ],
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        "uncountable"
      ]
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  ],
  "translations": [
    {
      "code": "cmn",
      "lang": "Chinese Mandarin",
      "roman": "zhōngyóu",
      "sense": "the middle portion of a river",
      "word": "中游"
    },
    {
      "code": "cmn",
      "lang": "Chinese Mandarin",
      "roman": "zhōngliú",
      "sense": "the middle portion of a river",
      "word": "中流"
    },
    {
      "code": "fi",
      "lang": "Finnish",
      "sense": "the middle portion of a river",
      "word": "keskijuoksu"
    },
    {
      "code": "de",
      "lang": "German",
      "sense": "the middle portion of a river",
      "tags": [
        "masculine"
      ],
      "word": "Mittellauf"
    },
    {
      "code": "hu",
      "lang": "Hungarian",
      "sense": "the middle portion of a river",
      "word": "középső szakasz/folyás"
    },
    {
      "code": "hu",
      "lang": "Hungarian",
      "sense": "the middle portion of a river",
      "tags": [
        "figuratively"
      ],
      "word": "középső szint"
    },
    {
      "alt": "ちゅうりゅう",
      "code": "ja",
      "lang": "Japanese",
      "roman": "chūryū",
      "sense": "the middle portion of a river",
      "word": "中流"
    },
    {
      "code": "ko",
      "lang": "Korean",
      "roman": "jungnyu",
      "sense": "the middle portion of a river",
      "word": "중류"
    },
    {
      "code": "vi",
      "lang": "Vietnamese",
      "sense": "the middle portion of a river",
      "word": "trung lưu"
    }
  ],
  "word": "middle reaches"
}