"yellow knight" meaning in English

{
  "forms": [
    {
      "form": "yellow knights",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "yellow knight (plural yellow knights)",
      "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": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "lifeform",
          "langcode": "en",
          "name": "Fungi",
          "orig": "en:Fungi",
          "parents": [
            "Lifeforms",
            "All topics",
            "Life",
            "Fundamental",
            "Nature"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A widely eaten but arguably toxic fungus, Tricholoma equestre, that forms ectomycorrhiza with pine trees."
      ],
      "id": "en-yellow_knight-en-noun-16nwTrwL",
      "links": [
        [
          "fungus",
          "fungus"
        ],
        [
          "Tricholoma equestre",
          "Tricholoma equestre#Translingual"
        ],
        [
          "ectomycorrhiza",
          "ectomycorrhiza"
        ],
        [
          "pine tree",
          "pine tree"
        ]
      ],
      "synonyms": [
        {
          "word": "man on horseback"
        },
        {
          "word": "saddle-shaped tricholoma"
        }
      ]
    }
  ],
  "word": "yellow knight"
}

{
  "forms": [
    {
      "form": "yellow knights",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "yellow knight (plural yellow knights)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
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        "Pages with entries",
        "en:Fungi"
      ],
      "glosses": [
        "A widely eaten but arguably toxic fungus, Tricholoma equestre, that forms ectomycorrhiza with pine trees."
      ],
      "links": [
        [
          "fungus",
          "fungus"
        ],
        [
          "Tricholoma equestre",
          "Tricholoma equestre#Translingual"
        ],
        [
          "ectomycorrhiza",
          "ectomycorrhiza"
        ],
        [
          "pine tree",
          "pine tree"
        ]
      ],
      "synonyms": [
        {
          "word": "man on horseback"
        },
        {
          "word": "saddle-shaped tricholoma"
        }
      ]
    }
  ],
  "word": "yellow knight"
}