"dirty pool" meaning in English

{
  "etymology_text": "Probably an allusion to failing to follow the rules when playing billiards. Compare not cricket.",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "dirty pool (uncountable)",
      "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": "1967 April 21, Keith Wheeler, Sandy Smith, “Murf the Surf and his Jewel-studded Jinx”, in Life, volume 62, number 16, page 95",
          "text": "The thieves, in their turn, have developed a self-pity syndrome about the FBI, considering government surveillance to be dirty pool — unjustifiable interference with free enterprise.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Foul play, misconduct, underhandedness."
      ],
      "id": "en-dirty_pool-en-noun-CC8V0Ada",
      "links": [
        [
          "Foul play",
          "foul play"
        ],
        [
          "misconduct",
          "misconduct"
        ],
        [
          "underhandedness",
          "underhandedness"
        ]
      ],
      "raw_glosses": [
        "(slang) Foul play, misconduct, underhandedness."
      ],
      "tags": [
        "slang",
        "uncountable"
      ]
    }
  ],
  "sounds": [
    {
      "audio": "En-au-dirty pool.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/c/c9/En-au-dirty_pool.ogg/En-au-dirty_pool.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/c/c9/En-au-dirty_pool.ogg",
      "tags": [
        "Australia"
      ],
      "text": "Audio (AU)"
    }
  ],
  "word": "dirty pool"
}

{
  "etymology_text": "Probably an allusion to failing to follow the rules when playing billiards. Compare not cricket.",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "dirty pool (uncountable)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English slang",
        "English terms with audio links",
        "English terms with quotations",
        "English uncountable nouns"
      ],
      "examples": [
        {
          "ref": "1967 April 21, Keith Wheeler, Sandy Smith, “Murf the Surf and his Jewel-studded Jinx”, in Life, volume 62, number 16, page 95",
          "text": "The thieves, in their turn, have developed a self-pity syndrome about the FBI, considering government surveillance to be dirty pool — unjustifiable interference with free enterprise.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Foul play, misconduct, underhandedness."
      ],
      "links": [
        [
          "Foul play",
          "foul play"
        ],
        [
          "misconduct",
          "misconduct"
        ],
        [
          "underhandedness",
          "underhandedness"
        ]
      ],
      "raw_glosses": [
        "(slang) Foul play, misconduct, underhandedness."
      ],
      "tags": [
        "slang",
        "uncountable"
      ]
    }
  ],
  "sounds": [
    {
      "audio": "En-au-dirty pool.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/c/c9/En-au-dirty_pool.ogg/En-au-dirty_pool.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/c/c9/En-au-dirty_pool.ogg",
      "tags": [
        "Australia"
      ],
      "text": "Audio (AU)"
    }
  ],
  "word": "dirty pool"
}