"capstan screw" meaning in English

{
  "forms": [
    {
      "form": "capstan screws",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "capstan screw (plural capstan screws)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "glosses": [
        "A type of screw commonly used to regulate the height of the action in a piano. The capstan screw is designed to be turned from the side, not the head, unlike an ordinary screw. A lever enters a hole in the side of the screw to turn it."
      ],
      "id": "en-capstan_screw-en-noun-Y3A2q1hs"
    },
    {
      "categories": [
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Nautical",
          "orig": "en:Nautical",
          "parents": [
            "Transport",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "_dis": "42 58",
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "Mainly on sailboats, the mechanism for winding ropes under a lot of tension; a capstan."
      ],
      "id": "en-capstan_screw-en-noun-4A3E27ex",
      "links": [
        [
          "nautical",
          "nautical"
        ],
        [
          "capstan",
          "capstan"
        ]
      ],
      "raw_glosses": [
        "(nautical) Mainly on sailboats, the mechanism for winding ropes under a lot of tension; a capstan."
      ],
      "topics": [
        "nautical",
        "transport"
      ]
    }
  ],
  "word": "capstan screw"
}

{
  "categories": [
    "English countable nouns",
    "English entries with incorrect language header",
    "English lemmas",
    "English multiword terms",
    "English nouns"
  ],
  "forms": [
    {
      "form": "capstan screws",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "capstan screw (plural capstan screws)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "glosses": [
        "A type of screw commonly used to regulate the height of the action in a piano. The capstan screw is designed to be turned from the side, not the head, unlike an ordinary screw. A lever enters a hole in the side of the screw to turn it."
      ]
    },
    {
      "categories": [
        "en:Nautical"
      ],
      "glosses": [
        "Mainly on sailboats, the mechanism for winding ropes under a lot of tension; a capstan."
      ],
      "links": [
        [
          "nautical",
          "nautical"
        ],
        [
          "capstan",
          "capstan"
        ]
      ],
      "raw_glosses": [
        "(nautical) Mainly on sailboats, the mechanism for winding ropes under a lot of tension; a capstan."
      ],
      "topics": [
        "nautical",
        "transport"
      ]
    }
  ],
  "word": "capstan screw"
}