"on the gridiron" meaning in English

{
  "head_templates": [
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      "args": {
        "1": "en",
        "2": "prepositional phrase"
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      "expansion": "on the gridiron",
      "name": "head"
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  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "prep_phrase",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
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          "source": "w"
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          "parents": [],
          "source": "w"
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          "parents": [],
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      "examples": [
        {
          "ref": "1917 January 17, The Referee, Sydney, page 9, column 3:",
          "text": "Palmer stuck to his task very pluckily, not withstanding that Edwards at times attacked with almost bulldog ferocity. The Mexican was on the grid-iron and he knew it.",
          "type": "quote"
        }
      ],
      "glosses": [
        "On the grid; in strife; at a disadvantage."
      ],
      "id": "en-on_the_gridiron-en-prep_phrase-x0CcNX42",
      "links": [
        [
          "On the grid",
          "on the grid"
        ],
        [
          "strife",
          "strife"
        ],
        [
          "disadvantage",
          "disadvantage"
        ]
      ]
    }
  ],
  "word": "on the gridiron"
}

{
  "head_templates": [
    {
      "args": {
        "1": "en",
        "2": "prepositional phrase"
      },
      "expansion": "on the gridiron",
      "name": "head"
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  "lang": "English",
  "lang_code": "en",
  "pos": "prep_phrase",
  "senses": [
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        "English lemmas",
        "English multiword terms",
        "English prepositional phrases",
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        "Pages with 1 entry",
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      "examples": [
        {
          "ref": "1917 January 17, The Referee, Sydney, page 9, column 3:",
          "text": "Palmer stuck to his task very pluckily, not withstanding that Edwards at times attacked with almost bulldog ferocity. The Mexican was on the grid-iron and he knew it.",
          "type": "quote"
        }
      ],
      "glosses": [
        "On the grid; in strife; at a disadvantage."
      ],
      "links": [
        [
          "On the grid",
          "on the grid"
        ],
        [
          "strife",
          "strife"
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          "disadvantage",
          "disadvantage"
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      ]
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  ],
  "word": "on the gridiron"
}