"mußt" meaning in German

{
  "head_templates": [
    {
      "args": {
        "1": "de",
        "2": "verb form"
      },
      "expansion": "mußt",
      "name": "head"
    }
  ],
  "lang": "German",
  "lang_code": "de",
  "pos": "verb",
  "senses": [
    {
      "alt_of": [
        {
          "extra": "(Rechtschreibreform) of 1996",
          "word": "musst which was deprecated in the spelling reform"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "German entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "German links with redundant alt parameters",
          "parents": [
            "Links with redundant alt parameters",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "German words affected by 1996 spelling reform",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Formerly standard spelling of musst which was deprecated in the spelling reform (Rechtschreibreform) of 1996."
      ],
      "id": "en-mußt-de-verb-d-tECmx2",
      "links": [
        [
          "musst",
          "musst#German"
        ]
      ],
      "tags": [
        "alt-of",
        "archaic"
      ]
    }
  ],
  "word": "mußt"
}

{
  "head_templates": [
    {
      "args": {
        "1": "de",
        "2": "verb form"
      },
      "expansion": "mußt",
      "name": "head"
    }
  ],
  "lang": "German",
  "lang_code": "de",
  "pos": "verb",
  "senses": [
    {
      "alt_of": [
        {
          "extra": "(Rechtschreibreform) of 1996",
          "word": "musst which was deprecated in the spelling reform"
        }
      ],
      "categories": [
        "German entries with incorrect language header",
        "German links with redundant alt parameters",
        "German non-lemma forms",
        "German superseded forms",
        "German verb forms",
        "German words affected by 1996 spelling reform",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "glosses": [
        "Formerly standard spelling of musst which was deprecated in the spelling reform (Rechtschreibreform) of 1996."
      ],
      "links": [
        [
          "musst",
          "musst#German"
        ]
      ],
      "tags": [
        "alt-of",
        "archaic"
      ]
    }
  ],
  "word": "mußt"
}