"chin guard" meaning in English

{
  "forms": [
    {
      "form": "chin guards",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "chin guard (plural chin guards)",
      "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": "topical",
          "langcode": "en",
          "name": "Headwear",
          "orig": "en:Headwear",
          "parents": [
            "Clothing",
            "Human",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A protective guard for a person's chin."
      ],
      "id": "en-chin_guard-en-noun-3CuoKbbt",
      "links": [
        [
          "protective",
          "protective"
        ],
        [
          "guard",
          "guard"
        ],
        [
          "chin",
          "chin"
        ]
      ],
      "related": [
        {
          "word": "faceguard"
        },
        {
          "word": "face guard"
        },
        {
          "word": "faceshield"
        },
        {
          "word": "face shield"
        },
        {
          "word": "noseguard"
        },
        {
          "word": "nose guard"
        }
      ],
      "synonyms": [
        {
          "tags": [
            "rare"
          ],
          "word": "chinguard"
        }
      ]
    }
  ],
  "word": "chin guard"
}

{
  "forms": [
    {
      "form": "chin guards",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "chin guard (plural chin guards)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "faceguard"
    },
    {
      "word": "face guard"
    },
    {
      "word": "faceshield"
    },
    {
      "word": "face shield"
    },
    {
      "word": "noseguard"
    },
    {
      "word": "nose guard"
    }
  ],
  "senses": [
    {
      "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:Headwear"
      ],
      "glosses": [
        "A protective guard for a person's chin."
      ],
      "links": [
        [
          "protective",
          "protective"
        ],
        [
          "guard",
          "guard"
        ],
        [
          "chin",
          "chin"
        ]
      ]
    }
  ],
  "synonyms": [
    {
      "tags": [
        "rare"
      ],
      "word": "chinguard"
    }
  ],
  "word": "chin guard"
}