"-b" meaning in Hungarian

{
  "etymology_templates": [
    {
      "args": {
        "1": "hu",
        "2": "fiu-pro",
        "3": "*-mp"
      },
      "expansion": "Proto-Finno-Ugric *-mp",
      "name": "inh"
    },
    {
      "args": {
        "1": "fi",
        "2": "-mpi"
      },
      "expansion": "Finnish -mpi",
      "name": "cog"
    }
  ],
  "etymology_text": "From Proto-Finno-Ugric *-mp. In the Proto-Hungarian period it became -b due to regular phonetic change, then later lengthened to -bb. Cognates include Finnish -mpi.",
  "head_templates": [
    {
      "args": {
        "1": "hu",
        "2": "suffix"
      },
      "expansion": "-b",
      "name": "head"
    }
  ],
  "lang": "Hungarian",
  "lang_code": "hu",
  "pos": "suffix",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Hungarian entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Hungarian suffixes with archaic senses",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 3 entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "_dis": "18 39 8 35",
          "kind": "other",
          "name": "Pages using catfix",
          "parents": [],
          "source": "w+disamb"
        }
      ],
      "examples": [
        {
          "text": "idős (“old”) + -b → idősb (“older, senior”)",
          "type": "example"
        },
        {
          "text": "külön (“separate”) + -b → különb (“superior”, split from the original)",
          "type": "example"
        },
        {
          "text": "súlyos (“serious, grave”) + -b → súlyosbodik (“to become graver”)",
          "type": "example"
        },
        {
          "text": "súlyos (“serious, grave”) + -b → súlyosbít (“to make graver, aggravate”)",
          "type": "example"
        },
        {
          "text": "öreg (“old (archaic: grand, great)”) + -b → öregbít (“to enhance, bolster [reputation], literally “to make greater””)",
          "type": "example"
        },
        {
          "text": "helyes (“correct, right”) + -b → helyesbít (“to rectify”)",
          "type": "example"
        },
        {
          "text": "kevés (“few, little [in quantity]”) + -b → kevésbé (“less [to less extent/degree]”), kevesbít (“to lessen”)",
          "type": "example"
        },
        {
          "text": "utol (“at the end”, obsolete) + -b → utóbb (“later”, originally utolb)",
          "type": "example"
        }
      ],
      "glosses": [
        "-er, more (still used in compound verb-forming suffixes)"
      ],
      "id": "en--b-hu-suffix-oUfpUer2",
      "links": [
        [
          "-er",
          "-er"
        ],
        [
          "more",
          "more"
        ]
      ],
      "raw_glosses": [
        "(comparative suffix, somewhat archaic) -er, more (still used in compound verb-forming suffixes)"
      ],
      "tags": [
        "archaic",
        "comparative",
        "morpheme",
        "suffix"
      ]
    }
  ],
  "word": "-b"
}

{
  "categories": [
    "Pages using catfix",
    "Pages with 3 entries",
    "Pages with entries"
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "hu",
        "2": "fiu-pro",
        "3": "*-mp"
      },
      "expansion": "Proto-Finno-Ugric *-mp",
      "name": "inh"
    },
    {
      "args": {
        "1": "fi",
        "2": "-mpi"
      },
      "expansion": "Finnish -mpi",
      "name": "cog"
    }
  ],
  "etymology_text": "From Proto-Finno-Ugric *-mp. In the Proto-Hungarian period it became -b due to regular phonetic change, then later lengthened to -bb. Cognates include Finnish -mpi.",
  "head_templates": [
    {
      "args": {
        "1": "hu",
        "2": "suffix"
      },
      "expansion": "-b",
      "name": "head"
    }
  ],
  "lang": "Hungarian",
  "lang_code": "hu",
  "pos": "suffix",
  "senses": [
    {
      "categories": [
        "Hungarian entries with incorrect language header",
        "Hungarian lemmas",
        "Hungarian suffixes",
        "Hungarian suffixes with archaic senses",
        "Hungarian terms derived from Proto-Finno-Ugric",
        "Hungarian terms inherited from Proto-Finno-Ugric",
        "Pages with 3 entries",
        "Pages with entries"
      ],
      "examples": [
        {
          "text": "idős (“old”) + -b → idősb (“older, senior”)",
          "type": "example"
        },
        {
          "text": "külön (“separate”) + -b → különb (“superior”, split from the original)",
          "type": "example"
        },
        {
          "text": "súlyos (“serious, grave”) + -b → súlyosbodik (“to become graver”)",
          "type": "example"
        },
        {
          "text": "súlyos (“serious, grave”) + -b → súlyosbít (“to make graver, aggravate”)",
          "type": "example"
        },
        {
          "text": "öreg (“old (archaic: grand, great)”) + -b → öregbít (“to enhance, bolster [reputation], literally “to make greater””)",
          "type": "example"
        },
        {
          "text": "helyes (“correct, right”) + -b → helyesbít (“to rectify”)",
          "type": "example"
        },
        {
          "text": "kevés (“few, little [in quantity]”) + -b → kevésbé (“less [to less extent/degree]”), kevesbít (“to lessen”)",
          "type": "example"
        },
        {
          "text": "utol (“at the end”, obsolete) + -b → utóbb (“later”, originally utolb)",
          "type": "example"
        }
      ],
      "glosses": [
        "-er, more (still used in compound verb-forming suffixes)"
      ],
      "links": [
        [
          "-er",
          "-er"
        ],
        [
          "more",
          "more"
        ]
      ],
      "raw_glosses": [
        "(comparative suffix, somewhat archaic) -er, more (still used in compound verb-forming suffixes)"
      ],
      "tags": [
        "archaic",
        "comparative",
        "morpheme",
        "suffix"
      ]
    }
  ],
  "word": "-b"
}