"M'sieur" meaning in French

{
  "forms": [
    {
      "form": "M’ sieur",
      "tags": [
        "canonical",
        "masculine"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "m",
        "2": "-"
      },
      "expansion": "M’sieur m (uncountable)",
      "name": "fr-noun"
    }
  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "French entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "english": "Wasn't me, sir!",
          "text": "C’est pas moi, M’sieur!",
          "type": "example"
        }
      ],
      "glosses": [
        "Syncopic form of Monsieur, chiefly used by children"
      ],
      "id": "en-M'sieur-fr-noun-k5Q1Bjce",
      "links": [
        [
          "Monsieur",
          "Monsieur#French"
        ]
      ],
      "synonyms": [
        {
          "word": "m’sieu"
        }
      ],
      "tags": [
        "uncountable"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/msjø/"
    }
  ],
  "word": "M'sieur"
}

{
  "forms": [
    {
      "form": "M’ sieur",
      "tags": [
        "canonical",
        "masculine"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "m",
        "2": "-"
      },
      "expansion": "M’sieur m (uncountable)",
      "name": "fr-noun"
    }
  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "French 1-syllable words",
        "French childish terms",
        "French entries with incorrect language header",
        "French lemmas",
        "French masculine nouns",
        "French nouns",
        "French syncopic forms",
        "French terms with IPA pronunciation",
        "French terms with usage examples",
        "French uncountable nouns"
      ],
      "examples": [
        {
          "english": "Wasn't me, sir!",
          "text": "C’est pas moi, M’sieur!",
          "type": "example"
        }
      ],
      "glosses": [
        "Syncopic form of Monsieur, chiefly used by children"
      ],
      "links": [
        [
          "Monsieur",
          "Monsieur#French"
        ]
      ],
      "tags": [
        "uncountable"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/msjø/"
    }
  ],
  "synonyms": [
    {
      "word": "m’sieu"
    }
  ],
  "word": "M'sieur"
}