"pack on" meaning in English

{
  "forms": [
    {
      "form": "packs on",
      "tags": [
        "present",
        "singular",
        "third-person"
      ]
    },
    {
      "form": "packing on",
      "tags": [
        "participle",
        "present"
      ]
    },
    {
      "form": "packed on",
      "tags": [
        "participle",
        "past"
      ]
    },
    {
      "form": "packed on",
      "tags": [
        "past"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "*"
      },
      "expansion": "pack on (third-person singular simple present packs on, present participle packing on, simple past and past participle packed on)",
      "name": "en-verb"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "verb",
  "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 phrasal verbs with particle (on)",
          "parents": [],
          "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": "Bodybuilding",
          "orig": "en:Bodybuilding",
          "parents": [
            "Sports",
            "Human activity",
            "Human behaviour",
            "Human",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "derived": [
        {
          "word": "pack on the pounds"
        }
      ],
      "examples": [
        {
          "ref": "2006, Joel Marion, Men's Fitness, Dec/Jan, p. 102",
          "text": "Most strength coaches agree that to gain an inch on your arms, you have to pack on at least 10 pounds of body mass."
        },
        {
          "ref": "2010 October 21, Margaret Munro, “Dad's eating habits weigh heavily on offspring: study”, in Vancouver Sun, Canada, retrieved 2010-11-13",
          "text": "The nine males packed on so much fat their weight increased to more than 700 grams.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "To add (fat, muscle, etc.) so as to increase mass or bulk."
      ],
      "id": "en-pack_on-en-verb-eZdtIZQw",
      "links": [
        [
          "add",
          "add"
        ],
        [
          "fat",
          "fat"
        ],
        [
          "muscle",
          "muscle"
        ],
        [
          "mass",
          "mass"
        ],
        [
          "bulk",
          "bulk"
        ]
      ],
      "raw_glosses": [
        "(transitive, informal) To add (fat, muscle, etc.) so as to increase mass or bulk."
      ],
      "tags": [
        "informal",
        "transitive"
      ]
    }
  ],
  "word": "pack on"
}

{
  "derived": [
    {
      "word": "pack on the pounds"
    }
  ],
  "forms": [
    {
      "form": "packs on",
      "tags": [
        "present",
        "singular",
        "third-person"
      ]
    },
    {
      "form": "packing on",
      "tags": [
        "participle",
        "present"
      ]
    },
    {
      "form": "packed on",
      "tags": [
        "participle",
        "past"
      ]
    },
    {
      "form": "packed on",
      "tags": [
        "past"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "*"
      },
      "expansion": "pack on (third-person singular simple present packs on, present participle packing on, simple past and past participle packed on)",
      "name": "en-verb"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "verb",
  "senses": [
    {
      "categories": [
        "English entries with incorrect language header",
        "English entries with topic categories using raw markup",
        "English informal terms",
        "English lemmas",
        "English multiword terms",
        "English phrasal verbs",
        "English phrasal verbs with particle (on)",
        "English terms with non-redundant non-automated sortkeys",
        "English terms with quotations",
        "English transitive verbs",
        "English verbs",
        "en:Bodybuilding"
      ],
      "examples": [
        {
          "ref": "2006, Joel Marion, Men's Fitness, Dec/Jan, p. 102",
          "text": "Most strength coaches agree that to gain an inch on your arms, you have to pack on at least 10 pounds of body mass."
        },
        {
          "ref": "2010 October 21, Margaret Munro, “Dad's eating habits weigh heavily on offspring: study”, in Vancouver Sun, Canada, retrieved 2010-11-13",
          "text": "The nine males packed on so much fat their weight increased to more than 700 grams.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "To add (fat, muscle, etc.) so as to increase mass or bulk."
      ],
      "links": [
        [
          "add",
          "add"
        ],
        [
          "fat",
          "fat"
        ],
        [
          "muscle",
          "muscle"
        ],
        [
          "mass",
          "mass"
        ],
        [
          "bulk",
          "bulk"
        ]
      ],
      "raw_glosses": [
        "(transitive, informal) To add (fat, muscle, etc.) so as to increase mass or bulk."
      ],
      "tags": [
        "informal",
        "transitive"
      ]
    }
  ],
  "word": "pack on"
}