"derb-" meaning in Old Irish

{
  "derived": [
    {
      "_dis1": "0 0",
      "english": "sign, portent",
      "word": "derbairde"
    },
    {
      "_dis1": "0 0",
      "english": "foster-brother",
      "word": "derbchomalta"
    },
    {
      "_dis1": "0 0",
      "english": "family group of four generations",
      "word": "derbfine"
    },
    {
      "_dis1": "0 0",
      "word": "derbforgell"
    },
    {
      "_dis1": "0 0",
      "english": "brother",
      "word": "derbráthair"
    },
    {
      "_dis1": "0 0",
      "english": "sister",
      "word": "derbṡiur"
    }
  ],
  "descendants": [
    {
      "depth": 1,
      "templates": [
        {
          "args": {
            "1": "ga",
            "2": "dearbh-"
          },
          "expansion": "Irish: dearbh-",
          "name": "desc"
        }
      ],
      "text": "Irish: dearbh-"
    }
  ],
  "etymology_text": "From derb (“sure, certain, fixed, determinate”).",
  "head_templates": [
    {
      "args": {
        "1": "sga",
        "2": "prefix"
      },
      "expansion": "derb-",
      "name": "head"
    }
  ],
  "lang": "Old Irish",
  "lang_code": "sga",
  "pos": "prefix",
  "senses": [
    {
      "glosses": [
        "surely, really, truly; used as intensifier"
      ],
      "id": "en-derb--sga-prefix-JmM5afKO",
      "links": [
        [
          "surely",
          "surely"
        ],
        [
          "really",
          "really"
        ],
        [
          "truly",
          "truly"
        ],
        [
          "intensifier",
          "intensifier"
        ]
      ],
      "raw_glosses": [
        "(with adjective) surely, really, truly; used as intensifier"
      ],
      "raw_tags": [
        "with adjective"
      ],
      "tags": [
        "morpheme"
      ]
    },
    {
      "categories": [
        {
          "_dis": "30 70",
          "kind": "other",
          "name": "Old Irish entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "39 61",
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "20 80",
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "sure, certain, reliable; genuine; own, special; used with a set of kinship words, with which it forms stable compounds"
      ],
      "id": "en-derb--sga-prefix-Zk9ZocCz",
      "links": [
        [
          "sure",
          "sure"
        ],
        [
          "certain",
          "certain"
        ],
        [
          "reliable",
          "reliable"
        ],
        [
          "genuine",
          "genuine"
        ],
        [
          "own",
          "own"
        ],
        [
          "special",
          "special"
        ],
        [
          "kinship",
          "kinship"
        ]
      ],
      "raw_glosses": [
        "(with substantive) sure, certain, reliable; genuine; own, special; used with a set of kinship words, with which it forms stable compounds"
      ],
      "raw_tags": [
        "with substantive"
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "word": "derb-"
}

{
  "categories": [
    "Old Irish entries with incorrect language header",
    "Old Irish lemmas",
    "Old Irish prefixes",
    "Pages with 1 entry",
    "Pages with entries"
  ],
  "derived": [
    {
      "english": "sign, portent",
      "word": "derbairde"
    },
    {
      "english": "foster-brother",
      "word": "derbchomalta"
    },
    {
      "english": "family group of four generations",
      "word": "derbfine"
    },
    {
      "word": "derbforgell"
    },
    {
      "english": "brother",
      "word": "derbráthair"
    },
    {
      "english": "sister",
      "word": "derbṡiur"
    }
  ],
  "descendants": [
    {
      "depth": 1,
      "templates": [
        {
          "args": {
            "1": "ga",
            "2": "dearbh-"
          },
          "expansion": "Irish: dearbh-",
          "name": "desc"
        }
      ],
      "text": "Irish: dearbh-"
    }
  ],
  "etymology_text": "From derb (“sure, certain, fixed, determinate”).",
  "head_templates": [
    {
      "args": {
        "1": "sga",
        "2": "prefix"
      },
      "expansion": "derb-",
      "name": "head"
    }
  ],
  "lang": "Old Irish",
  "lang_code": "sga",
  "pos": "prefix",
  "senses": [
    {
      "glosses": [
        "surely, really, truly; used as intensifier"
      ],
      "links": [
        [
          "surely",
          "surely"
        ],
        [
          "really",
          "really"
        ],
        [
          "truly",
          "truly"
        ],
        [
          "intensifier",
          "intensifier"
        ]
      ],
      "raw_glosses": [
        "(with adjective) surely, really, truly; used as intensifier"
      ],
      "raw_tags": [
        "with adjective"
      ],
      "tags": [
        "morpheme"
      ]
    },
    {
      "glosses": [
        "sure, certain, reliable; genuine; own, special; used with a set of kinship words, with which it forms stable compounds"
      ],
      "links": [
        [
          "sure",
          "sure"
        ],
        [
          "certain",
          "certain"
        ],
        [
          "reliable",
          "reliable"
        ],
        [
          "genuine",
          "genuine"
        ],
        [
          "own",
          "own"
        ],
        [
          "special",
          "special"
        ],
        [
          "kinship",
          "kinship"
        ]
      ],
      "raw_glosses": [
        "(with substantive) sure, certain, reliable; genuine; own, special; used with a set of kinship words, with which it forms stable compounds"
      ],
      "raw_tags": [
        "with substantive"
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "word": "derb-"
}