"blue water" meaning in English

{
  "forms": [
    {
      "form": "blue waters",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "~"
      },
      "expansion": "blue water (countable and uncountable, plural blue waters)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English entries with topic categories using raw markup",
          "parents": [
            "Entries with topic categories using raw markup",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English terms with non-redundant non-automated sortkeys",
          "parents": [
            "Terms with non-redundant non-automated sortkeys",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Water",
          "orig": "en:Water",
          "parents": [
            "Liquids",
            "Matter",
            "Chemistry",
            "Nature",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "derived": [
        {
          "word": "clear blue water"
        }
      ],
      "examples": [
        {
          "text": "After clearing the cape, they still had an hour's sailing to reach blue water."
        }
      ],
      "glosses": [
        "The open ocean; deep seas."
      ],
      "id": "en-blue_water-en-noun-PbeH157K",
      "synonyms": [
        {
          "tags": [
            "attributive"
          ],
          "word": "blue-water:"
        }
      ],
      "tags": [
        "countable",
        "uncountable"
      ]
    }
  ],
  "word": "blue water"
}

{
  "derived": [
    {
      "word": "clear blue water"
    }
  ],
  "forms": [
    {
      "form": "blue waters",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "~"
      },
      "expansion": "blue water (countable and uncountable, plural blue waters)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English entries with topic categories using raw markup",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with non-redundant non-automated sortkeys",
        "English uncountable nouns",
        "en:Water"
      ],
      "examples": [
        {
          "text": "After clearing the cape, they still had an hour's sailing to reach blue water."
        }
      ],
      "glosses": [
        "The open ocean; deep seas."
      ],
      "tags": [
        "countable",
        "uncountable"
      ]
    }
  ],
  "synonyms": [
    {
      "tags": [
        "attributive"
      ],
      "word": "blue-water:"
    }
  ],
  "word": "blue water"
}