"covert hack" meaning in English

{
  "forms": [
    {
      "form": "covert hacks",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "covert hack (plural covert hacks)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "langcode": "en",
          "name": "Hunting",
          "orig": "en:Hunting",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "bold_text_offsets": [
            [
              190,
              202
            ]
          ],
          "ref": "1862, Mary Elizabeth Braddon, Lady Audley's Secret:",
          "text": "The honest young country squires, who talked all breakfast time of […] glorious runs of seven hours' hard riding over three counties, and a midnight homeward ride of thirty miles upon their covert hacks; […]",
          "type": "quotation"
        }
      ],
      "glosses": [
        "A horse ridden to and from the hunt (as opposed to the hunter ridden during the hunt)."
      ],
      "id": "en-covert_hack-en-noun-EzrexiyT",
      "links": [
        [
          "hunting",
          "hunting#Noun"
        ],
        [
          "horse",
          "horse"
        ],
        [
          "hunt",
          "hunt"
        ],
        [
          "hunter",
          "hunter"
        ]
      ],
      "raw_glosses": [
        "(hunting, historical) A horse ridden to and from the hunt (as opposed to the hunter ridden during the hunt)."
      ],
      "related": [
        {
          "word": "covert hound"
        }
      ],
      "tags": [
        "historical"
      ],
      "topics": [
        "hobbies",
        "hunting",
        "lifestyle"
      ]
    }
  ],
  "word": "covert hack"
}

{
  "forms": [
    {
      "form": "covert hacks",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "covert hack (plural covert hacks)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "covert hound"
    }
  ],
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with historical senses",
        "English terms with quotations",
        "Pages with 1 entry",
        "Pages with entries",
        "Quotation templates to be cleaned",
        "en:Hunting"
      ],
      "examples": [
        {
          "bold_text_offsets": [
            [
              190,
              202
            ]
          ],
          "ref": "1862, Mary Elizabeth Braddon, Lady Audley's Secret:",
          "text": "The honest young country squires, who talked all breakfast time of […] glorious runs of seven hours' hard riding over three counties, and a midnight homeward ride of thirty miles upon their covert hacks; […]",
          "type": "quotation"
        }
      ],
      "glosses": [
        "A horse ridden to and from the hunt (as opposed to the hunter ridden during the hunt)."
      ],
      "links": [
        [
          "hunting",
          "hunting#Noun"
        ],
        [
          "horse",
          "horse"
        ],
        [
          "hunt",
          "hunt"
        ],
        [
          "hunter",
          "hunter"
        ]
      ],
      "raw_glosses": [
        "(hunting, historical) A horse ridden to and from the hunt (as opposed to the hunter ridden during the hunt)."
      ],
      "tags": [
        "historical"
      ],
      "topics": [
        "hobbies",
        "hunting",
        "lifestyle"
      ]
    }
  ],
  "word": "covert hack"
}