"all-comers" meaning in All languages combined

{
  "head_templates": [
    {
      "args": {
        "1": "p"
      },
      "expansion": "all-comers pl (plural only)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "all comers"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English pluralia tantum",
          "parents": [
            "Pluralia tantum",
            "Nouns",
            "Lemmas"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "The meeting is open to all-comers.",
          "type": "example"
        }
      ],
      "glosses": [
        "Alternative form of all comers"
      ],
      "id": "en-all-comers-en-noun-tNhedWix",
      "links": [
        [
          "all comers",
          "all comers#English"
        ]
      ],
      "tags": [
        "alt-of",
        "alternative",
        "plural",
        "plural-only"
      ]
    }
  ],
  "word": "all-comers"
}

{
  "head_templates": [
    {
      "args": {
        "1": "p"
      },
      "expansion": "all-comers pl (plural only)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "all comers"
        }
      ],
      "categories": [
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English pluralia tantum",
        "English terms with usage examples",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "examples": [
        {
          "text": "The meeting is open to all-comers.",
          "type": "example"
        }
      ],
      "glosses": [
        "Alternative form of all comers"
      ],
      "links": [
        [
          "all comers",
          "all comers#English"
        ]
      ],
      "tags": [
        "alt-of",
        "alternative",
        "plural",
        "plural-only"
      ]
    }
  ],
  "word": "all-comers"
}