"yard jockey" meaning in English

{
  "forms": [
    {
      "form": "yard jockeys",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "yard jockey (plural yard jockeys)",
      "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 links with manual fragments",
          "parents": [
            "Links with manual fragments",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Rail transportation",
          "orig": "en:Rail transportation",
          "parents": [
            "Transport",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": ";"
        }
      ],
      "glosses": [
        "A yardman who switches locomotives and rolling stock in a switchyard, or a truck driver who analogously switches tractors and semi-trailers at a truckyard or depot."
      ],
      "id": "en-yard_jockey-en-noun-uBaKz96Y",
      "links": [
        [
          "rail transport",
          "rail transport"
        ],
        [
          "yardman",
          "yardman"
        ],
        [
          "switches",
          "switch#Verb"
        ],
        [
          "locomotive",
          "locomotive"
        ],
        [
          "rolling stock",
          "rolling stock"
        ],
        [
          "switchyard",
          "switchyard"
        ],
        [
          "truck driver",
          "truck driver"
        ],
        [
          "tractor",
          "tractor"
        ],
        [
          "semi-trailer",
          "semi-trailer"
        ],
        [
          "truckyard",
          "truckyard"
        ],
        [
          "depot",
          "depot"
        ]
      ],
      "qualifier": "trucking",
      "raw_glosses": [
        "(rail transport, trucking) A yardman who switches locomotives and rolling stock in a switchyard, or a truck driver who analogously switches tractors and semi-trailers at a truckyard or depot."
      ],
      "related": [
        {
          "word": "jockeying"
        },
        {
          "tags": [
            "verb"
          ],
          "word": "jockey"
        },
        {
          "word": "railyard"
        }
      ],
      "synonyms": [
        {
          "word": "hostler"
        },
        {
          "word": "switcher"
        },
        {
          "word": "shunter"
        }
      ],
      "topics": [
        "rail-transport",
        "railways",
        "transport"
      ]
    }
  ],
  "word": "yard jockey"
}

{
  "forms": [
    {
      "form": "yard jockeys",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "yard jockey (plural yard jockeys)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "jockeying"
    },
    {
      "tags": [
        "verb"
      ],
      "word": "jockey"
    },
    {
      "word": "railyard"
    }
  ],
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English links with manual fragments",
        "English multiword terms",
        "English nouns",
        "Pages with 1 entry",
        "Pages with entries",
        "en:Rail transportation"
      ],
      "examples": [
        {
          "text": ";"
        }
      ],
      "glosses": [
        "A yardman who switches locomotives and rolling stock in a switchyard, or a truck driver who analogously switches tractors and semi-trailers at a truckyard or depot."
      ],
      "links": [
        [
          "rail transport",
          "rail transport"
        ],
        [
          "yardman",
          "yardman"
        ],
        [
          "switches",
          "switch#Verb"
        ],
        [
          "locomotive",
          "locomotive"
        ],
        [
          "rolling stock",
          "rolling stock"
        ],
        [
          "switchyard",
          "switchyard"
        ],
        [
          "truck driver",
          "truck driver"
        ],
        [
          "tractor",
          "tractor"
        ],
        [
          "semi-trailer",
          "semi-trailer"
        ],
        [
          "truckyard",
          "truckyard"
        ],
        [
          "depot",
          "depot"
        ]
      ],
      "qualifier": "trucking",
      "raw_glosses": [
        "(rail transport, trucking) A yardman who switches locomotives and rolling stock in a switchyard, or a truck driver who analogously switches tractors and semi-trailers at a truckyard or depot."
      ],
      "synonyms": [
        {
          "word": "hostler"
        },
        {
          "word": "switcher"
        },
        {
          "word": "shunter"
        }
      ],
      "topics": [
        "rail-transport",
        "railways",
        "transport"
      ]
    }
  ],
  "word": "yard jockey"
}