"inside man" meaning in English

{
  "forms": [
    {
      "form": "inside men",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "inside men"
      },
      "expansion": "inside man (plural inside men)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Synonym of shill (“an accomplice at a confidence trick during an auction or gambling game”)."
      ],
      "id": "en-inside_man-en-noun-4dX5P1kQ",
      "links": [
        [
          "shill",
          "shill#English"
        ]
      ],
      "related": [
        {
          "word": "con man"
        },
        {
          "word": "inside job"
        },
        {
          "word": "insider"
        },
        {
          "word": "insider trading"
        }
      ],
      "synonyms": [
        {
          "extra": "an accomplice at a confidence trick during an auction or gambling game",
          "tags": [
            "synonym",
            "synonym-of"
          ],
          "word": "shill"
        }
      ]
    }
  ],
  "word": "inside man"
}

{
  "forms": [
    {
      "form": "inside men",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "inside men"
      },
      "expansion": "inside man (plural inside men)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "con man"
    },
    {
      "word": "inside job"
    },
    {
      "word": "insider"
    },
    {
      "word": "insider trading"
    }
  ],
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "glosses": [
        "Synonym of shill (“an accomplice at a confidence trick during an auction or gambling game”)."
      ],
      "links": [
        [
          "shill",
          "shill#English"
        ]
      ],
      "synonyms": [
        {
          "extra": "an accomplice at a confidence trick during an auction or gambling game",
          "tags": [
            "synonym",
            "synonym-of"
          ],
          "word": "shill"
        }
      ]
    }
  ],
  "word": "inside man"
}