"party sub" meaning in English

{
  "forms": [
    {
      "form": "party subs",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "party sub (plural party subs)",
      "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": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Sandwiches",
          "orig": "en:Sandwiches",
          "parents": [
            "Foods",
            "Eating",
            "Food and drink",
            "Human behaviour",
            "All topics",
            "Human",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A very long submarine sandwich typically served at parties and other catered events, where either the guest or the host slices the sandwich into pieces fit for one person's appetite."
      ],
      "hypernyms": [
        {
          "word": "submarine sandwich"
        }
      ],
      "id": "en-party_sub-en-noun-Xfl1Z1Hj",
      "links": [
        [
          "submarine sandwich",
          "submarine sandwich"
        ],
        [
          "parties",
          "party"
        ],
        [
          "catered",
          "catered"
        ]
      ]
    }
  ],
  "word": "party sub"
}

{
  "forms": [
    {
      "form": "party subs",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "party sub (plural party subs)",
      "name": "en-noun"
    }
  ],
  "hypernyms": [
    {
      "word": "submarine sandwich"
    }
  ],
  "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",
        "Pages with 1 entry",
        "Pages with entries",
        "en:Sandwiches"
      ],
      "glosses": [
        "A very long submarine sandwich typically served at parties and other catered events, where either the guest or the host slices the sandwich into pieces fit for one person's appetite."
      ],
      "links": [
        [
          "submarine sandwich",
          "submarine sandwich"
        ],
        [
          "parties",
          "party"
        ],
        [
          "catered",
          "catered"
        ]
      ]
    }
  ],
  "word": "party sub"
}