"'chas" meaning in Yola

{
  "etymology_templates": [
    {
      "args": {
        "1": "yol",
        "2": "'ch-",
        "3": "was"
      },
      "expansion": "'ch- + was",
      "name": "prefix"
    }
  ],
  "etymology_text": "'ch- + was",
  "head_templates": [
    {
      "args": {
        "1": "yol",
        "2": "contraction"
      },
      "expansion": "'chas",
      "name": "head"
    }
  ],
  "lang": "Yola",
  "lang_code": "yol",
  "pos": "contraction",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Yola entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Yola terms prefixed with 'ch-",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "english": "I was greatly mistaken.",
          "ref": "1867, GLOSSARY OF THE DIALECT OF FORTH AND BARGY, page 26",
          "text": "Ich as (or 'chas) greatly blin.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "I was"
      ],
      "id": "en-'chas-yol-contraction-aWhY8u8Y",
      "links": [
        [
          "I",
          "I"
        ],
        [
          "was",
          "was"
        ]
      ],
      "synonyms": [
        {
          "word": "chas"
        }
      ],
      "tags": [
        "contraction"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/t͡ʃɔːz/"
    }
  ],
  "word": "'chas"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "yol",
        "2": "'ch-",
        "3": "was"
      },
      "expansion": "'ch- + was",
      "name": "prefix"
    }
  ],
  "etymology_text": "'ch- + was",
  "head_templates": [
    {
      "args": {
        "1": "yol",
        "2": "contraction"
      },
      "expansion": "'chas",
      "name": "head"
    }
  ],
  "lang": "Yola",
  "lang_code": "yol",
  "pos": "contraction",
  "senses": [
    {
      "categories": [
        "Yola contractions",
        "Yola entries with incorrect language header",
        "Yola non-lemma forms",
        "Yola terms prefixed with 'ch-",
        "Yola terms with IPA pronunciation",
        "Yola terms with quotations"
      ],
      "examples": [
        {
          "english": "I was greatly mistaken.",
          "ref": "1867, GLOSSARY OF THE DIALECT OF FORTH AND BARGY, page 26",
          "text": "Ich as (or 'chas) greatly blin.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "I was"
      ],
      "links": [
        [
          "I",
          "I"
        ],
        [
          "was",
          "was"
        ]
      ],
      "tags": [
        "contraction"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/t͡ʃɔːz/"
    }
  ],
  "synonyms": [
    {
      "word": "chas"
    }
  ],
  "word": "'chas"
}