"msg." meaning in English

{
  "head_templates": [
    {
      "args": {
        "1": "?"
      },
      "expansion": "msg.",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "message"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "1974 April 6, “Personal advertisement”, in Gay Community News, page 9",
          "text": "Call Box 354-4309, leave msg., or see me at Coffee House Fri. night behind counter.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Abbreviation of message."
      ],
      "id": "en-msg.-en-noun-Dgh5yXIP",
      "links": [
        [
          "message",
          "message#English"
        ]
      ],
      "tags": [
        "abbreviation",
        "alt-of"
      ]
    }
  ],
  "word": "msg."
}

{
  "head_templates": [
    {
      "args": {
        "1": "?"
      },
      "expansion": "msg.",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "message"
        }
      ],
      "categories": [
        "English abbreviations",
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English nouns",
        "English nouns with unknown or uncertain plurals",
        "English terms spelled with .",
        "English terms with quotations",
        "English words without vowels"
      ],
      "examples": [
        {
          "ref": "1974 April 6, “Personal advertisement”, in Gay Community News, page 9",
          "text": "Call Box 354-4309, leave msg., or see me at Coffee House Fri. night behind counter.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Abbreviation of message."
      ],
      "links": [
        [
          "message",
          "message#English"
        ]
      ],
      "tags": [
        "abbreviation",
        "alt-of"
      ]
    }
  ],
  "word": "msg."
}