"rkub" meaning in Maltese

{
  "head_templates": [
    {
      "args": {
        "g": "m",
        "inst": "rikba"
      },
      "expansion": "rkub m (instance noun rikba)",
      "name": "mt-verbal noun"
    }
  ],
  "lang": "Maltese",
  "lang_code": "mt",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Maltese entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Maltese links with redundant alt parameters",
          "parents": [
            "Links with redundant alt parameters",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Maltese terms belonging to the root r-k-b",
          "parents": [],
          "source": "w"
        }
      ],
      "form_of": [
        {
          "word": "rikeb"
        }
      ],
      "glosses": [
        "verbal noun of rikeb"
      ],
      "id": "en-rkub-mt-noun--FW6ow~i",
      "links": [
        [
          "rikeb",
          "rikeb#Maltese"
        ]
      ],
      "tags": [
        "form-of",
        "masculine",
        "noun-from-verb"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/(ɪ)rˈkuːp/"
    }
  ],
  "word": "rkub"
}

{
  "head_templates": [
    {
      "args": {
        "g": "m",
        "inst": "rikba"
      },
      "expansion": "rkub m (instance noun rikba)",
      "name": "mt-verbal noun"
    }
  ],
  "lang": "Maltese",
  "lang_code": "mt",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Maltese 2-syllable words",
        "Maltese entries with incorrect language header",
        "Maltese lemmas",
        "Maltese links with redundant alt parameters",
        "Maltese masculine nouns",
        "Maltese nouns",
        "Maltese terms belonging to the root r-k-b",
        "Maltese terms with IPA pronunciation",
        "Maltese verbal nouns"
      ],
      "form_of": [
        {
          "word": "rikeb"
        }
      ],
      "glosses": [
        "verbal noun of rikeb"
      ],
      "links": [
        [
          "rikeb",
          "rikeb#Maltese"
        ]
      ],
      "tags": [
        "form-of",
        "masculine",
        "noun-from-verb"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/(ɪ)rˈkuːp/"
    }
  ],
  "word": "rkub"
}

{
  "called_from": "form_descriptions/1698",
  "msg": "unrecognized head form: instance noun rikba",
  "path": [
    "rkub"
  ],
  "section": "Maltese",
  "subsection": "noun",
  "title": "rkub",
  "trace": ""
}