"mb'" meaning in Irish

{
  "forms": [
    {
      "form": "mb’",
      "tags": [
        "canonical"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "ga",
        "2": "mutated particle",
        "head": "mb’"
      },
      "expansion": "mb’",
      "name": "head"
    }
  ],
  "lang": "Irish",
  "lang_code": "ga",
  "pos": "particle",
  "senses": [
    {
      "alt_of": [
        {
          "word": "b’"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "Irish entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Irish mutated particles",
          "parents": [
            "Mutated particles",
            "Mutated forms",
            "Particle forms",
            "Non-lemma forms",
            "Particles",
            "Lemmas"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Eclipsed form of b’."
      ],
      "id": "en-mb'-ga-particle-~YQuc0Pk",
      "links": [
        [
          "b’",
          "b'#Irish"
        ]
      ],
      "tags": [
        "abbreviation",
        "alt-of",
        "eclipsis"
      ]
    }
  ],
  "word": "mb'"
}

{
  "forms": [
    {
      "form": "mb’",
      "tags": [
        "canonical"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "ga",
        "2": "mutated particle",
        "head": "mb’"
      },
      "expansion": "mb’",
      "name": "head"
    }
  ],
  "lang": "Irish",
  "lang_code": "ga",
  "pos": "particle",
  "senses": [
    {
      "alt_of": [
        {
          "word": "b’"
        }
      ],
      "categories": [
        "Irish eclipsed forms",
        "Irish entries with incorrect language header",
        "Irish mutated particles",
        "Irish non-lemma forms",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "glosses": [
        "Eclipsed form of b’."
      ],
      "links": [
        [
          "b’",
          "b'#Irish"
        ]
      ],
      "tags": [
        "abbreviation",
        "alt-of",
        "eclipsis"
      ]
    }
  ],
  "word": "mb'"
}