"shear legs" meaning in English

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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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        {
          "ref": "1979 August, Michael Harris, “A line for all reasons: the North Yorkshire Moors Railway”, in Railway World, pages 412, 414:",
          "text": "Apart from its unique public viewing gallery, the depot features 40-ton capacity shear legs which will be complemented shortly by an overhead lifting crane.",
          "type": "quote"
        }
      ],
      "glosses": [
        "A form of derrick, consisting of three poles and a block and tackle, used to hoist and lower heavy weights, especially the masts of sailing ships."
      ],
      "id": "en-shear_legs-en-noun-hVCFitmb",
      "links": [
        [
          "nautical",
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        [
          "derrick",
          "derrick"
        ],
        [
          "pole",
          "pole"
        ],
        [
          "block and tackle",
          "block and tackle"
        ],
        [
          "hoist",
          "hoist"
        ],
        [
          "lower",
          "lower"
        ],
        [
          "mast",
          "mast"
        ]
      ],
      "raw_glosses": [
        "(nautical) A form of derrick, consisting of three poles and a block and tackle, used to hoist and lower heavy weights, especially the masts of sailing ships."
      ],
      "synonyms": [
        {
          "word": "sheers"
        },
        {
          "word": "shearlegs"
        },
        {
          "word": "sheerlegs"
        },
        {
          "word": "sheer legs"
        }
      ],
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        "uncountable"
      ],
      "topics": [
        "nautical",
        "transport"
      ],
      "translations": [
        {
          "code": "mi",
          "lang": "Maori",
          "sense": "device for lifting heavy weights",
          "word": "tokorangi"
        }
      ],
      "wikipedia": [
        "Sheers"
      ]
    }
  ],
  "word": "shear legs"
}

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  "lang_code": "en",
  "pos": "noun",
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          "text": "Apart from its unique public viewing gallery, the depot features 40-ton capacity shear legs which will be complemented shortly by an overhead lifting crane.",
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        }
      ],
      "glosses": [
        "A form of derrick, consisting of three poles and a block and tackle, used to hoist and lower heavy weights, especially the masts of sailing ships."
      ],
      "links": [
        [
          "nautical",
          "nautical"
        ],
        [
          "derrick",
          "derrick"
        ],
        [
          "pole",
          "pole"
        ],
        [
          "block and tackle",
          "block and tackle"
        ],
        [
          "hoist",
          "hoist"
        ],
        [
          "lower",
          "lower"
        ],
        [
          "mast",
          "mast"
        ]
      ],
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        "(nautical) A form of derrick, consisting of three poles and a block and tackle, used to hoist and lower heavy weights, especially the masts of sailing ships."
      ],
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        "uncountable"
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      "topics": [
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        "transport"
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      "wikipedia": [
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  "synonyms": [
    {
      "word": "sheers"
    },
    {
      "word": "shearlegs"
    },
    {
      "word": "sheerlegs"
    },
    {
      "word": "sheer legs"
    }
  ],
  "translations": [
    {
      "code": "mi",
      "lang": "Maori",
      "sense": "device for lifting heavy weights",
      "word": "tokorangi"
    }
  ],
  "word": "shear legs"
}