"barleycorn sight" meaning in English

{
  "forms": [
    {
      "form": "barleycorn sights",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "barleycorn sight (plural barleycorn sights)",
      "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": "topical",
          "langcode": "en",
          "name": "Weapons",
          "orig": "en:Weapons",
          "parents": [
            "Hunting",
            "Military",
            "Tools",
            "Human activity",
            "Society",
            "Technology",
            "Human behaviour",
            "All topics",
            "Human",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A type of front sight of triangular appearance."
      ],
      "id": "en-barleycorn_sight-en-noun-kskIq3j2",
      "links": [
        [
          "weaponry",
          "weaponry"
        ],
        [
          "front",
          "front"
        ],
        [
          "sight",
          "sight"
        ],
        [
          "triangular",
          "triangular"
        ],
        [
          "appearance",
          "appearance"
        ]
      ],
      "raw_glosses": [
        "(weaponry) A type of front sight of triangular appearance."
      ],
      "synonyms": [
        {
          "word": "pyramid sight"
        }
      ],
      "topics": [
        "engineering",
        "government",
        "military",
        "natural-sciences",
        "physical-sciences",
        "politics",
        "tools",
        "war",
        "weaponry"
      ]
    }
  ],
  "word": "barleycorn sight"
}

{
  "forms": [
    {
      "form": "barleycorn sights",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "barleycorn sight (plural barleycorn sights)",
      "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",
        "Pages with 1 entry",
        "en:Weapons"
      ],
      "glosses": [
        "A type of front sight of triangular appearance."
      ],
      "links": [
        [
          "weaponry",
          "weaponry"
        ],
        [
          "front",
          "front"
        ],
        [
          "sight",
          "sight"
        ],
        [
          "triangular",
          "triangular"
        ],
        [
          "appearance",
          "appearance"
        ]
      ],
      "raw_glosses": [
        "(weaponry) A type of front sight of triangular appearance."
      ],
      "synonyms": [
        {
          "word": "pyramid sight"
        }
      ],
      "topics": [
        "engineering",
        "government",
        "military",
        "natural-sciences",
        "physical-sciences",
        "politics",
        "tools",
        "war",
        "weaponry"
      ]
    }
  ],
  "word": "barleycorn sight"
}