"su" meaning in Upper Sorbian

{
  "head_templates": [
    {
      "args": {
        "1": "hsb",
        "2": "verb form"
      },
      "expansion": "su",
      "name": "head"
    }
  ],
  "hyphenation": [
    "su"
  ],
  "lang": "Upper Sorbian",
  "lang_code": "hsb",
  "pos": "verb",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Upper Sorbian entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "english": "They are traveling.",
          "text": "Woni su na pućowanjach.",
          "type": "example"
        }
      ],
      "form_of": [
        {
          "word": "być"
        }
      ],
      "glosses": [
        "third-person plural present of być"
      ],
      "id": "en-su-hsb-verb-xtC-cjHy",
      "links": [
        [
          "być",
          "być#Upper Sorbian"
        ]
      ],
      "tags": [
        "form-of",
        "plural",
        "present",
        "third-person"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˈsu/"
    },
    {
      "rhymes": "-u"
    }
  ],
  "word": "su"
}

{
  "categories": [
    "White Hmong entries with incorrect language header",
    "White Hmong lemmas",
    "White Hmong terms with IPA pronunciation",
    "White Hmong verbs"
  ],
  "head_templates": [
    {
      "args": {
        "1": "hsb",
        "2": "verb form"
      },
      "expansion": "su",
      "name": "head"
    }
  ],
  "hyphenation": [
    "su"
  ],
  "lang": "Upper Sorbian",
  "lang_code": "hsb",
  "pos": "verb",
  "senses": [
    {
      "categories": [
        "Rhymes:Upper Sorbian/u",
        "Rhymes:Upper Sorbian/u/1 syllable",
        "Upper Sorbian entries with incorrect language header",
        "Upper Sorbian non-lemma forms",
        "Upper Sorbian terms with IPA pronunciation",
        "Upper Sorbian terms with usage examples",
        "Upper Sorbian verb forms"
      ],
      "examples": [
        {
          "english": "They are traveling.",
          "text": "Woni su na pućowanjach.",
          "type": "example"
        }
      ],
      "form_of": [
        {
          "word": "być"
        }
      ],
      "glosses": [
        "third-person plural present of być"
      ],
      "links": [
        [
          "być",
          "być#Upper Sorbian"
        ]
      ],
      "tags": [
        "form-of",
        "plural",
        "present",
        "third-person"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˈsu/"
    },
    {
      "rhymes": "-u"
    }
  ],
  "word": "su"
}