"count 'em" meaning in English

{
  "head_templates": [
    {
      "args": {
        "1": "en",
        "2": "phrase"
      },
      "expansion": "count 'em",
      "name": "head"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "phrase",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "2001, Suzanne Ostro, “Antisocial Baby Notes”, in Rochelle Ratner, editor, Bearing Life: Women's Writings on Childlessness, page 66",
          "text": "Once I went to Greece with a man who had left his wife and six—count 'em, six—children.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Emphasizes a number; literally, check the number yourself."
      ],
      "id": "en-count_'em-en-phrase-T0dHylBg",
      "links": [
        [
          "number",
          "number#English"
        ],
        [
          "check",
          "check"
        ],
        [
          "yourself",
          "yourself"
        ]
      ],
      "raw_glosses": [
        "(informal) Emphasizes a number; literally, check the number yourself."
      ],
      "synonyms": [
        {
          "word": "count them"
        }
      ],
      "tags": [
        "informal"
      ]
    }
  ],
  "word": "count 'em"
}

{
  "head_templates": [
    {
      "args": {
        "1": "en",
        "2": "phrase"
      },
      "expansion": "count 'em",
      "name": "head"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "phrase",
  "senses": [
    {
      "categories": [
        "English entries with incorrect language header",
        "English informal terms",
        "English lemmas",
        "English multiword terms",
        "English phrases",
        "English terms with quotations"
      ],
      "examples": [
        {
          "ref": "2001, Suzanne Ostro, “Antisocial Baby Notes”, in Rochelle Ratner, editor, Bearing Life: Women's Writings on Childlessness, page 66",
          "text": "Once I went to Greece with a man who had left his wife and six—count 'em, six—children.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Emphasizes a number; literally, check the number yourself."
      ],
      "links": [
        [
          "number",
          "number#English"
        ],
        [
          "check",
          "check"
        ],
        [
          "yourself",
          "yourself"
        ]
      ],
      "raw_glosses": [
        "(informal) Emphasizes a number; literally, check the number yourself."
      ],
      "tags": [
        "informal"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "count them"
    }
  ],
  "word": "count 'em"
}