"mus" meaning in Sranan Tongo

{
  "etymology_templates": [
    {
      "args": {
        "1": "srn",
        "2": "en",
        "3": "must"
      },
      "expansion": "English must",
      "name": "der"
    }
  ],
  "etymology_text": "From English must.",
  "head_templates": [
    {
      "args": {
        "1": "srn",
        "2": "verb"
      },
      "expansion": "mus",
      "name": "head"
    }
  ],
  "lang": "Sranan Tongo",
  "lang_code": "srn",
  "pos": "verb",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Sranan Tongo entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "to have to, must"
      ],
      "id": "en-mus-srn-verb-jw~8V49m",
      "links": [
        [
          "have to",
          "have to"
        ],
        [
          "must",
          "must"
        ]
      ],
      "raw_glosses": [
        "(auxiliary) to have to, must"
      ],
      "tags": [
        "auxiliary"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/mus/"
    }
  ],
  "word": "mus"
}

{
  "categories": [
    "Iu Mien terms in nonstandard scripts",
    "White Hmong entries with incorrect language header",
    "White Hmong interjections",
    "White Hmong lemmas",
    "White Hmong terms derived from Proto-Hmong",
    "White Hmong terms derived from Proto-Hmong-Mien",
    "White Hmong terms inherited from Proto-Hmong",
    "White Hmong terms inherited from Proto-Hmong-Mien",
    "White Hmong terms with IPA pronunciation",
    "White Hmong verbs"
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "srn",
        "2": "en",
        "3": "must"
      },
      "expansion": "English must",
      "name": "der"
    }
  ],
  "etymology_text": "From English must.",
  "head_templates": [
    {
      "args": {
        "1": "srn",
        "2": "verb"
      },
      "expansion": "mus",
      "name": "head"
    }
  ],
  "lang": "Sranan Tongo",
  "lang_code": "srn",
  "pos": "verb",
  "senses": [
    {
      "categories": [
        "Sranan Tongo auxiliary verbs",
        "Sranan Tongo entries with incorrect language header",
        "Sranan Tongo lemmas",
        "Sranan Tongo terms derived from English",
        "Sranan Tongo terms with IPA pronunciation",
        "Sranan Tongo verbs"
      ],
      "glosses": [
        "to have to, must"
      ],
      "links": [
        [
          "have to",
          "have to"
        ],
        [
          "must",
          "must"
        ]
      ],
      "raw_glosses": [
        "(auxiliary) to have to, must"
      ],
      "tags": [
        "auxiliary"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/mus/"
    }
  ],
  "word": "mus"
}