"-um" meaning in Icelandic

{
  "head_templates": [
    {
      "args": {
        "1": "is",
        "2": "suffix",
        "cat2": "inflectional suffixes"
      },
      "expansion": "-um",
      "name": "head"
    }
  ],
  "lang": "Icelandic",
  "lang_code": "is",
  "pos": "suffix",
  "senses": [
    {
      "categories": [
        {
          "_dis": "46 31 23",
          "kind": "other",
          "name": "Icelandic entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        }
      ],
      "examples": [
        {
          "text": "hestur → hestum — a horse → of the horses"
        },
        {
          "text": "ríkur → ríkum — rich → of the rich"
        }
      ],
      "glosses": [
        "Used to form the dative plural of most nouns, all strong adjectives and most pronouns."
      ],
      "id": "en--um-is-suffix-45ssaGeS",
      "tags": [
        "morpheme"
      ]
    },
    {
      "examples": [
        {
          "text": "telja (infinitive) → við teljum (we count or believe) (indicative)"
        },
        {
          "text": "við teldum subjunctive past tense, i.e., we would believe"
        }
      ],
      "glosses": [
        "Used to form the first person plural of verbs in the indicative and subjunctive, past and present."
      ],
      "id": "en--um-is-suffix-wunW-aiT",
      "tags": [
        "morpheme"
      ]
    },
    {
      "examples": [
        {
          "text": "stund (time, hour) → stundum — sometimes"
        },
        {
          "text": "langur (long) → löngum (oftentimes)."
        }
      ],
      "glosses": [
        "Used to form some adverbs from nouns or adjectives — it is actually a frozen dative"
      ],
      "id": "en--um-is-suffix-hNlMq2W3",
      "links": [
        [
          "adverbs",
          "adverbs"
        ],
        [
          "dative",
          "dative"
        ]
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "word": "-um"
}

{
  "categories": [
    "Icelandic entries with incorrect language header",
    "Icelandic inflectional suffixes",
    "Icelandic lemmas",
    "Icelandic suffixes"
  ],
  "head_templates": [
    {
      "args": {
        "1": "is",
        "2": "suffix",
        "cat2": "inflectional suffixes"
      },
      "expansion": "-um",
      "name": "head"
    }
  ],
  "lang": "Icelandic",
  "lang_code": "is",
  "pos": "suffix",
  "senses": [
    {
      "examples": [
        {
          "text": "hestur → hestum — a horse → of the horses"
        },
        {
          "text": "ríkur → ríkum — rich → of the rich"
        }
      ],
      "glosses": [
        "Used to form the dative plural of most nouns, all strong adjectives and most pronouns."
      ],
      "tags": [
        "morpheme"
      ]
    },
    {
      "examples": [
        {
          "text": "telja (infinitive) → við teljum (we count or believe) (indicative)"
        },
        {
          "text": "við teldum subjunctive past tense, i.e., we would believe"
        }
      ],
      "glosses": [
        "Used to form the first person plural of verbs in the indicative and subjunctive, past and present."
      ],
      "tags": [
        "morpheme"
      ]
    },
    {
      "examples": [
        {
          "text": "stund (time, hour) → stundum — sometimes"
        },
        {
          "text": "langur (long) → löngum (oftentimes)."
        }
      ],
      "glosses": [
        "Used to form some adverbs from nouns or adjectives — it is actually a frozen dative"
      ],
      "links": [
        [
          "adverbs",
          "adverbs"
        ],
        [
          "dative",
          "dative"
        ]
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "word": "-um"
}