"collar stud" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "collar",
        "3": "stud"
      },
      "expansion": "collar + stud",
      "name": "compound"
    }
  ],
  "etymology_text": "collar + stud",
  "forms": [
    {
      "form": "collar studs",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "collar stud (plural collar studs)",
      "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": "English entries with topic categories using raw markup",
          "parents": [
            "Entries with topic categories using raw markup",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English terms with non-redundant non-automated sortkeys",
          "parents": [
            "Terms with non-redundant non-automated sortkeys",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Clothing",
          "orig": "en:Clothing",
          "parents": [
            "Human",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A small fastener used to secure the collar of a shirt to the neckband."
      ],
      "id": "en-collar_stud-en-noun-bS~yCqIk",
      "links": [
        [
          "fastener",
          "fastener"
        ],
        [
          "collar",
          "collar"
        ],
        [
          "neckband",
          "neckband"
        ]
      ],
      "translations": [
        {
          "code": "ru",
          "lang": "Russian",
          "roman": "záponka dlja vorotničká",
          "sense": "A small fastener for the collar",
          "tags": [
            "feminine"
          ],
          "word": "за́понка для воротничка́"
        }
      ],
      "wikipedia": [
        "collar stud"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˈkɑ.lɚ stʌd/"
    }
  ],
  "word": "collar stud"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "collar",
        "3": "stud"
      },
      "expansion": "collar + stud",
      "name": "compound"
    }
  ],
  "etymology_text": "collar + stud",
  "forms": [
    {
      "form": "collar studs",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "collar stud (plural collar studs)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English compound terms",
        "English countable nouns",
        "English entries with incorrect language header",
        "English entries with topic categories using raw markup",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with IPA pronunciation",
        "English terms with non-redundant non-automated sortkeys",
        "en:Clothing"
      ],
      "glosses": [
        "A small fastener used to secure the collar of a shirt to the neckband."
      ],
      "links": [
        [
          "fastener",
          "fastener"
        ],
        [
          "collar",
          "collar"
        ],
        [
          "neckband",
          "neckband"
        ]
      ],
      "wikipedia": [
        "collar stud"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˈkɑ.lɚ stʌd/"
    }
  ],
  "translations": [
    {
      "code": "ru",
      "lang": "Russian",
      "roman": "záponka dlja vorotničká",
      "sense": "A small fastener for the collar",
      "tags": [
        "feminine"
      ],
      "word": "за́понка для воротничка́"
    }
  ],
  "word": "collar stud"
}