"cotter pin" meaning in English

{
  "forms": [
    {
      "form": "cotter pins",
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      "tags": [
        "plural"
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      "expansion": "cotter pin (plural cotter pins)",
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "American English",
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            "Tools",
            "Technology",
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            "Fundamental"
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        }
      ],
      "glosses": [
        "A split pin, the ends of which project through an object being fastened and are bent back to hold it in place."
      ],
      "head_nr": 1,
      "id": "en-cotter_pin-en-noun-4QLbZXm0",
      "links": [
        [
          "split pin",
          "split pin"
        ]
      ],
      "raw_glosses": [
        "(US) A split pin, the ends of which project through an object being fastened and are bent back to hold it in place."
      ],
      "tags": [
        "US"
      ]
    },
    {
      "categories": [
        {
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        }
      ],
      "glosses": [
        "A pin or wedge inserted through a slot to hold machine parts together; a cotter."
      ],
      "head_nr": 1,
      "id": "en-cotter_pin-en-noun-REivkLZC",
      "links": [
        [
          "pin",
          "pin"
        ],
        [
          "wedge",
          "wedge"
        ],
        [
          "cotter",
          "cotter"
        ]
      ],
      "raw_glosses": [
        "(UK) A pin or wedge inserted through a slot to hold machine parts together; a cotter."
      ],
      "tags": [
        "UK"
      ]
    }
  ],
  "wikipedia": [
    "cotter pin"
  ],
  "word": "cotter pin"
}

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    "en:Fasteners",
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  "forms": [
    {
      "form": "cotter pins",
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      "tags": [
        "plural"
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    {
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      "expansion": "cotter pin (plural cotter pins)",
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  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "American English"
      ],
      "glosses": [
        "A split pin, the ends of which project through an object being fastened and are bent back to hold it in place."
      ],
      "head_nr": 1,
      "links": [
        [
          "split pin",
          "split pin"
        ]
      ],
      "raw_glosses": [
        "(US) A split pin, the ends of which project through an object being fastened and are bent back to hold it in place."
      ],
      "tags": [
        "US"
      ]
    },
    {
      "categories": [
        "British English"
      ],
      "glosses": [
        "A pin or wedge inserted through a slot to hold machine parts together; a cotter."
      ],
      "head_nr": 1,
      "links": [
        [
          "pin",
          "pin"
        ],
        [
          "wedge",
          "wedge"
        ],
        [
          "cotter",
          "cotter"
        ]
      ],
      "raw_glosses": [
        "(UK) A pin or wedge inserted through a slot to hold machine parts together; a cotter."
      ],
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        "UK"
      ]
    }
  ],
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    "cotter pin"
  ],
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}

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  "msg": "later head without list of senses,template node #, cotter pin/English",
  "path": [
    "cotter pin"
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  "subsection": "noun",
  "title": "cotter pin",
  "trace": ""
}