"barrel bulk" meaning in English

{
  "forms": [
    {
      "form": "barrel bulks",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "barrel bulk (plural barrel bulks)",
      "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 entries with topic categories using raw markup",
          "parents": [
            "Entries with topic categories using raw markup",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English terms with non-redundant non-automated sortkeys",
          "parents": [
            "Terms with non-redundant non-automated sortkeys",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Units of measure",
          "orig": "en:Units of measure",
          "parents": [
            "Metrology",
            "Quantity",
            "Applied sciences",
            "Mathematics",
            "Sciences",
            "Formal sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A measure equal to five cubic feet, used in estimating capacity, as of a vessel for freight."
      ],
      "id": "en-barrel_bulk-en-noun-bl3h1ZJG",
      "links": [
        [
          "measure",
          "measure"
        ],
        [
          "five",
          "five"
        ],
        [
          "cubic feet",
          "cubic foot"
        ],
        [
          "capacity",
          "capacity"
        ],
        [
          "vessel",
          "vessel"
        ],
        [
          "freight",
          "freight"
        ]
      ]
    }
  ],
  "word": "barrel bulk"
}

{
  "forms": [
    {
      "form": "barrel bulks",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "barrel bulk (plural barrel bulks)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English entries with topic categories using raw markup",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with non-redundant non-automated sortkeys",
        "en:Units of measure"
      ],
      "glosses": [
        "A measure equal to five cubic feet, used in estimating capacity, as of a vessel for freight."
      ],
      "links": [
        [
          "measure",
          "measure"
        ],
        [
          "five",
          "five"
        ],
        [
          "cubic feet",
          "cubic foot"
        ],
        [
          "capacity",
          "capacity"
        ],
        [
          "vessel",
          "vessel"
        ],
        [
          "freight",
          "freight"
        ]
      ]
    }
  ],
  "word": "barrel bulk"
}