"spring shackle" meaning in English

{
  "forms": [
    {
      "form": "spring shackles",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "spring shackle (plural spring shackles)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "_dis": "93 7",
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "A shackle that closes by means of a spring."
      ],
      "id": "en-spring_shackle-en-noun-gKxRX1k5"
    },
    {
      "glosses": [
        "A shackle joining one spring of a vehicle with another, or with a rigid piece."
      ],
      "id": "en-spring_shackle-en-noun-GLB18MEP",
      "links": [
        [
          "vehicle",
          "vehicle"
        ],
        [
          "rigid",
          "rigid"
        ]
      ]
    }
  ],
  "word": "spring shackle"
}

{
  "categories": [
    "English countable nouns",
    "English entries with incorrect language header",
    "English lemmas",
    "English multiword terms",
    "English nouns"
  ],
  "forms": [
    {
      "form": "spring shackles",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "spring shackle (plural spring shackles)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "glosses": [
        "A shackle that closes by means of a spring."
      ]
    },
    {
      "glosses": [
        "A shackle joining one spring of a vehicle with another, or with a rigid piece."
      ],
      "links": [
        [
          "vehicle",
          "vehicle"
        ],
        [
          "rigid",
          "rigid"
        ]
      ]
    }
  ],
  "word": "spring shackle"
}