"docker hole" meaning in English

{
  "forms": [
    {
      "form": "docker holes",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "docker hole (plural docker holes)",
      "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"
        }
      ],
      "glosses": [
        "One of the tiny holes made in certain biscuits by the manufacturer, to prevent them expanding like bread."
      ],
      "id": "en-docker_hole-en-noun-A3zyDaPi",
      "links": [
        [
          "hole",
          "hole"
        ],
        [
          "biscuit",
          "biscuit"
        ],
        [
          "manufacturer",
          "manufacturer"
        ],
        [
          "expand",
          "expand"
        ],
        [
          "bread",
          "bread"
        ]
      ],
      "raw_glosses": [
        "(mostly plural) One of the tiny holes made in certain biscuits by the manufacturer, to prevent them expanding like bread."
      ],
      "tags": [
        "plural"
      ]
    }
  ],
  "word": "docker hole"
}

{
  "forms": [
    {
      "form": "docker holes",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "docker hole (plural docker holes)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns"
      ],
      "glosses": [
        "One of the tiny holes made in certain biscuits by the manufacturer, to prevent them expanding like bread."
      ],
      "links": [
        [
          "hole",
          "hole"
        ],
        [
          "biscuit",
          "biscuit"
        ],
        [
          "manufacturer",
          "manufacturer"
        ],
        [
          "expand",
          "expand"
        ],
        [
          "bread",
          "bread"
        ]
      ],
      "raw_glosses": [
        "(mostly plural) One of the tiny holes made in certain biscuits by the manufacturer, to prevent them expanding like bread."
      ],
      "tags": [
        "plural"
      ]
    }
  ],
  "word": "docker hole"
}