"◌̀" meaning in Italian

{
  "lang": "Italian",
  "lang_code": "it",
  "pos": "character",
  "related": [
    {
      "_dis1": "0 0",
      "word": "accento grave"
    }
  ],
  "senses": [
    {
      "categories": [
        {
          "_dis": "53 47",
          "kind": "topical",
          "name": "Italian diacritical marks",
          "parents": [
            "Diacritical marks",
            "Letters, symbols, and punctuation",
            "Symbols",
            "Orthography",
            "Writing",
            "Human behaviour",
            "Language",
            "Human",
            "Communication",
            "All topics",
            "Fundamental"
          ],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "marks unpredictable stress assignment. Outside lexicography, it may be limited to final syllables."
      ],
      "id": "en-◌̀-it-character-hjj2MkVq",
      "tags": [
        "diacritic"
      ]
    },
    {
      "categories": [
        {
          "_dis": "53 47",
          "kind": "topical",
          "name": "Italian diacritical marks",
          "parents": [
            "Diacritical marks",
            "Letters, symbols, and punctuation",
            "Symbols",
            "Orthography",
            "Writing",
            "Human behaviour",
            "Language",
            "Human",
            "Communication",
            "All topics",
            "Fundamental"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "34 66",
          "kind": "other",
          "name": "Italian entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "27 73",
          "kind": "other",
          "name": "Italian terms in nonstandard scripts",
          "parents": [
            "Terms in nonstandard scripts",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "distinguishes stressed /ɛ ɔ/ from /e o/."
      ],
      "id": "en-◌̀-it-character-PwuyT5sx",
      "tags": [
        "diacritic"
      ]
    }
  ],
  "word": "◌̀"
}

{
  "categories": [
    "Italian diacritical marks",
    "Italian entries with incorrect language header",
    "Italian lemmas",
    "Italian terms in nonstandard scripts"
  ],
  "lang": "Italian",
  "lang_code": "it",
  "pos": "character",
  "related": [
    {
      "word": "accento grave"
    }
  ],
  "senses": [
    {
      "glosses": [
        "marks unpredictable stress assignment. Outside lexicography, it may be limited to final syllables."
      ],
      "tags": [
        "diacritic"
      ]
    },
    {
      "glosses": [
        "distinguishes stressed /ɛ ɔ/ from /e o/."
      ],
      "tags": [
        "diacritic"
      ]
    }
  ],
  "word": "◌̀"
}