"marsh treader" meaning in English

{
  "forms": [
    {
      "form": "marsh treaders",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "marsh treader (plural marsh treaders)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "_dis": "85 15",
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
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          "source": "w+disamb"
        },
        {
          "_dis": "90 10",
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "85 15",
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "83 17",
          "kind": "lifeform",
          "langcode": "en",
          "name": "True bugs",
          "orig": "en:True bugs",
          "parents": [
            "Hemipterans",
            "Insects",
            "Arthropods",
            "Animals",
            "Lifeforms",
            "All topics",
            "Life",
            "Fundamental",
            "Nature"
          ],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "A water measurer"
      ],
      "id": "en-marsh_treader-en-noun-aNYS5nv-",
      "links": [
        [
          "water measurer",
          "water measurer"
        ]
      ]
    },
    {
      "categories": [],
      "glosses": [
        "Any insect in the superfamily Mesovelioidea, related to the water strider"
      ],
      "id": "en-marsh_treader-en-noun-ZNylwGKK",
      "links": [
        [
          "superfamily",
          "superfamily"
        ],
        [
          "water strider",
          "water strider"
        ]
      ]
    }
  ],
  "word": "marsh treader"
}

{
  "categories": [
    "English countable nouns",
    "English entries with incorrect language header",
    "English lemmas",
    "English multiword terms",
    "English nouns",
    "Pages with 1 entry",
    "Pages with entries",
    "en:True bugs"
  ],
  "forms": [
    {
      "form": "marsh treaders",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "marsh treader (plural marsh treaders)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "glosses": [
        "A water measurer"
      ],
      "links": [
        [
          "water measurer",
          "water measurer"
        ]
      ]
    },
    {
      "categories": [
        "Entries using missing taxonomic name (family)"
      ],
      "glosses": [
        "Any insect in the superfamily Mesovelioidea, related to the water strider"
      ],
      "links": [
        [
          "superfamily",
          "superfamily"
        ],
        [
          "water strider",
          "water strider"
        ]
      ]
    }
  ],
  "word": "marsh treader"
}