"sea-ground" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "sea",
        "3": "ground"
      },
      "expansion": "sea + ground",
      "name": "affix"
    }
  ],
  "etymology_text": "From sea + ground.",
  "forms": [
    {
      "form": "sea-grounds",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "sea-ground (plural sea-grounds)",
      "name": "en-noun"
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  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English endocentric compounds",
          "parents": [
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            "Compound terms",
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      "examples": [
        {
          "ref": "1882, “Ballad 51: Lizie Wan”, in The English and Scottish Popular Ballads, volume 1:",
          "text": "'I'll set my foot in a bottomless boat, / And swim to the sea-ground.'",
          "type": "quote"
        }
      ],
      "glosses": [
        "the bottom of the sea, seabed"
      ],
      "id": "en-sea-ground-en-noun-9SmeUdMz",
      "links": [
        [
          "seabed",
          "seabed"
        ]
      ],
      "translations": [
        {
          "code": "ang",
          "lang": "Old English",
          "sense": "sea bed",
          "word": "sægrund"
        }
      ]
    }
  ],
  "word": "sea-ground"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "sea",
        "3": "ground"
      },
      "expansion": "sea + ground",
      "name": "affix"
    }
  ],
  "etymology_text": "From sea + ground.",
  "forms": [
    {
      "form": "sea-grounds",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "sea-ground (plural sea-grounds)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
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        "English 2-syllable words",
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      "examples": [
        {
          "ref": "1882, “Ballad 51: Lizie Wan”, in The English and Scottish Popular Ballads, volume 1:",
          "text": "'I'll set my foot in a bottomless boat, / And swim to the sea-ground.'",
          "type": "quote"
        }
      ],
      "glosses": [
        "the bottom of the sea, seabed"
      ],
      "links": [
        [
          "seabed",
          "seabed"
        ]
      ]
    }
  ],
  "translations": [
    {
      "code": "ang",
      "lang": "Old English",
      "sense": "sea bed",
      "word": "sægrund"
    }
  ],
  "word": "sea-ground"
}