"m/" meaning in Danish

{
  "etymology_templates": [
    {
      "args": {
        "1": "da",
        "2": "de",
        "3": "m/"
      },
      "expansion": "German m/",
      "name": "bor"
    }
  ],
  "etymology_text": "Most probably adapted from German m/, abbreviating mit (“with”), rather than the other way around.",
  "head_templates": [
    {
      "args": {
        "1": "da",
        "2": "preposition",
        "head": "m/"
      },
      "expansion": "m/",
      "name": "head"
    }
  ],
  "lang": "Danish",
  "lang_code": "da",
  "pos": "prep",
  "senses": [
    {
      "alt_of": [
        {
          "extra": "with",
          "word": "med"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "Danish entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Danish prepositions",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 3 entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Abbreviation of med (“with”)."
      ],
      "id": "en-m/-da-prep-0Q11zqZz",
      "links": [
        [
          "med",
          "med#Danish"
        ]
      ],
      "tags": [
        "abbreviation",
        "alt-of"
      ]
    }
  ],
  "word": "m/"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "da",
        "2": "de",
        "3": "m/"
      },
      "expansion": "German m/",
      "name": "bor"
    }
  ],
  "etymology_text": "Most probably adapted from German m/, abbreviating mit (“with”), rather than the other way around.",
  "head_templates": [
    {
      "args": {
        "1": "da",
        "2": "preposition",
        "head": "m/"
      },
      "expansion": "m/",
      "name": "head"
    }
  ],
  "lang": "Danish",
  "lang_code": "da",
  "pos": "prep",
  "senses": [
    {
      "alt_of": [
        {
          "extra": "with",
          "word": "med"
        }
      ],
      "categories": [
        "Danish abbreviations",
        "Danish entries with incorrect language header",
        "Danish lemmas",
        "Danish prepositions",
        "Danish terms borrowed from German",
        "Danish terms derived from German",
        "Pages with 3 entries",
        "Pages with entries"
      ],
      "glosses": [
        "Abbreviation of med (“with”)."
      ],
      "links": [
        [
          "med",
          "med#Danish"
        ]
      ],
      "tags": [
        "abbreviation",
        "alt-of"
      ]
    }
  ],
  "word": "m/"
}