"chalk player" meaning in English

{
  "forms": [
    {
      "form": "chalk players",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "chalk player (plural chalk players)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "2011, David L. Hudson, Horse Racing's Most Wanted",
          "text": "Chalk players can make money if the favorites come in as expected, but since there are so many upsets in horse racing, it is risky to always play the favorites.",
          "type": "quotation"
        },
        {
          "text": "2013, Editors of TIME Magazine, Inside the Red Border\nYet, the chalk players have such confidence in Secretariat that a $2 bet will likely fetch no more than $2.10 or $2.20 if he wins at Belmont."
        }
      ],
      "glosses": [
        "Synonym of chalk eater (“one who bets on racehorses that are favourites to win”)"
      ],
      "id": "en-chalk_player-en-noun-2q6F03dJ",
      "links": [
        [
          "chalk eater",
          "chalk eater#English"
        ]
      ],
      "raw_glosses": [
        "(slang) Synonym of chalk eater (“one who bets on racehorses that are favourites to win”)"
      ],
      "synonyms": [
        {
          "extra": "one who bets on racehorses that are favourites to win",
          "tags": [
            "synonym",
            "synonym-of"
          ],
          "word": "chalk eater"
        }
      ],
      "tags": [
        "slang"
      ]
    }
  ],
  "word": "chalk player"
}

{
  "forms": [
    {
      "form": "chalk players",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "chalk player (plural chalk players)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English slang",
        "English terms with quotations",
        "Quotation templates to be cleaned"
      ],
      "examples": [
        {
          "ref": "2011, David L. Hudson, Horse Racing's Most Wanted",
          "text": "Chalk players can make money if the favorites come in as expected, but since there are so many upsets in horse racing, it is risky to always play the favorites.",
          "type": "quotation"
        },
        {
          "text": "2013, Editors of TIME Magazine, Inside the Red Border\nYet, the chalk players have such confidence in Secretariat that a $2 bet will likely fetch no more than $2.10 or $2.20 if he wins at Belmont."
        }
      ],
      "glosses": [
        "Synonym of chalk eater (“one who bets on racehorses that are favourites to win”)"
      ],
      "links": [
        [
          "chalk eater",
          "chalk eater#English"
        ]
      ],
      "raw_glosses": [
        "(slang) Synonym of chalk eater (“one who bets on racehorses that are favourites to win”)"
      ],
      "synonyms": [
        {
          "extra": "one who bets on racehorses that are favourites to win",
          "tags": [
            "synonym",
            "synonym-of"
          ],
          "word": "chalk eater"
        }
      ],
      "tags": [
        "slang"
      ]
    }
  ],
  "word": "chalk player"
}