"chopper coupling" meaning in English

{
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    {
      "form": "chopper couplings",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
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      "args": {},
      "expansion": "chopper coupling (plural chopper couplings)",
      "name": "en-noun"
    }
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
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        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
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          "source": "w"
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        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Rail transportation",
          "orig": "en:Rail transportation",
          "parents": [
            "Transport",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Synonym of Norwegian coupling"
      ],
      "id": "en-chopper_coupling-en-noun-DFozSmXh",
      "links": [
        [
          "rail transport",
          "rail transport"
        ],
        [
          "Norwegian coupling",
          "Norwegian coupling#English"
        ]
      ],
      "raw_glosses": [
        "(rail transport) Synonym of Norwegian coupling"
      ],
      "synonyms": [
        {
          "tags": [
            "synonym",
            "synonym-of"
          ],
          "word": "Norwegian coupling"
        }
      ],
      "topics": [
        "rail-transport",
        "railways",
        "transport"
      ]
    }
  ],
  "word": "chopper coupling"
}

{
  "forms": [
    {
      "form": "chopper couplings",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "chopper coupling (plural chopper couplings)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
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        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
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        "en:Rail transportation"
      ],
      "glosses": [
        "Synonym of Norwegian coupling"
      ],
      "links": [
        [
          "rail transport",
          "rail transport"
        ],
        [
          "Norwegian coupling",
          "Norwegian coupling#English"
        ]
      ],
      "raw_glosses": [
        "(rail transport) Synonym of Norwegian coupling"
      ],
      "synonyms": [
        {
          "tags": [
            "synonym",
            "synonym-of"
          ],
          "word": "Norwegian coupling"
        }
      ],
      "topics": [
        "rail-transport",
        "railways",
        "transport"
      ]
    }
  ],
  "word": "chopper coupling"
}