"◌̱" meaning in Choctaw

{
  "head_templates": [
    {
      "args": {
        "1": "cho",
        "2": "diacritical mark"
      },
      "expansion": "◌̱",
      "name": "head"
    }
  ],
  "lang": "Choctaw",
  "lang_code": "cho",
  "pos": "character",
  "senses": [
    {
      "categories": [
        {
          "kind": "topical",
          "name": "Choctaw diacritical marks",
          "parents": [
            "Diacritical marks",
            "Letters, symbols, and punctuation",
            "Symbols",
            "Orthography",
            "Writing",
            "Human behaviour",
            "Language",
            "Human",
            "Communication",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Choctaw entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
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          "source": "w"
        },
        {
          "kind": "other",
          "name": "Choctaw terms in nonstandard scripts",
          "parents": [
            "Terms in nonstandard scripts",
            "Entry maintenance"
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          "source": "w"
        },
        {
          "kind": "other",
          "name": "Combining characters",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 3 entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "indicates a nasal vowel a̱, i̱, o̱"
      ],
      "id": "en-◌̱-cho-character-M2NA4BXl",
      "links": [
        [
          "nasal",
          "nasal#English"
        ],
        [
          "a̱",
          "a̱#English"
        ],
        [
          "i̱",
          "i̱#English"
        ],
        [
          "o̱",
          "o̱#English"
        ]
      ],
      "tags": [
        "diacritic"
      ]
    }
  ],
  "word": "◌̱"
}

{
  "head_templates": [
    {
      "args": {
        "1": "cho",
        "2": "diacritical mark"
      },
      "expansion": "◌̱",
      "name": "head"
    }
  ],
  "lang": "Choctaw",
  "lang_code": "cho",
  "pos": "character",
  "senses": [
    {
      "categories": [
        "Choctaw diacritical marks",
        "Choctaw entries with incorrect language header",
        "Choctaw lemmas",
        "Choctaw terms in nonstandard scripts",
        "Combining characters",
        "Pages with 3 entries",
        "Pages with entries"
      ],
      "glosses": [
        "indicates a nasal vowel a̱, i̱, o̱"
      ],
      "links": [
        [
          "nasal",
          "nasal#English"
        ],
        [
          "a̱",
          "a̱#English"
        ],
        [
          "i̱",
          "i̱#English"
        ],
        [
          "o̱",
          "o̱#English"
        ]
      ],
      "tags": [
        "diacritic"
      ]
    }
  ],
  "word": "◌̱"
}