"bk" meaning in English

{
  "forms": [
    {
      "form": "bks",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "bk (plural bks)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "book"
        }
      ],
      "categories": [
        {
          "_dis": "46 34 19",
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "25 6 53 6 10",
          "kind": "other",
          "name": "Pages with 3 entries",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "24 6 53 6 10",
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "Abbreviation of book."
      ],
      "id": "en-bk-en-noun-SBzV7K~j",
      "links": [
        [
          "book",
          "book#English"
        ]
      ],
      "tags": [
        "abbreviation",
        "alt-of"
      ]
    },
    {
      "alt_of": [
        {
          "word": "black"
        }
      ],
      "categories": [],
      "glosses": [
        "Abbreviation of black."
      ],
      "id": "en-bk-en-noun-lyTzGm34",
      "links": [
        [
          "black",
          "black#English"
        ]
      ],
      "tags": [
        "abbreviation",
        "alt-of"
      ]
    },
    {
      "alt_of": [
        {
          "extra": "an inexperienced player or noob",
          "word": "bad kid"
        }
      ],
      "categories": [
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Video games",
          "orig": "en:Video games",
          "parents": [
            "Games",
            "Mass media",
            "Software",
            "Recreation",
            "Culture",
            "Media",
            "Computing",
            "Human activity",
            "Society",
            "Communication",
            "Technology",
            "Human behaviour",
            "All topics",
            "Human",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Initialism of bad kid, an inexperienced player or noob."
      ],
      "id": "en-bk-en-noun-0GiZRndF",
      "links": [
        [
          "video game",
          "video game"
        ],
        [
          "bad",
          "bad#English"
        ],
        [
          "kid",
          "kid#English"
        ],
        [
          "noob",
          "noob"
        ]
      ],
      "raw_glosses": [
        "(video games, slang) Initialism of bad kid, an inexperienced player or noob."
      ],
      "tags": [
        "abbreviation",
        "alt-of",
        "initialism",
        "slang"
      ],
      "topics": [
        "video-games"
      ]
    }
  ],
  "word": "bk"
}

{
  "categories": [
    "English countable nouns",
    "English entries with incorrect language header",
    "English lemmas",
    "English nouns",
    "English words without vowels",
    "Pages with 3 entries",
    "Pages with entries"
  ],
  "forms": [
    {
      "form": "bks",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "bk (plural bks)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "book"
        }
      ],
      "categories": [
        "English abbreviations"
      ],
      "glosses": [
        "Abbreviation of book."
      ],
      "links": [
        [
          "book",
          "book#English"
        ]
      ],
      "tags": [
        "abbreviation",
        "alt-of"
      ]
    },
    {
      "alt_of": [
        {
          "word": "black"
        }
      ],
      "categories": [
        "English abbreviations"
      ],
      "glosses": [
        "Abbreviation of black."
      ],
      "links": [
        [
          "black",
          "black#English"
        ]
      ],
      "tags": [
        "abbreviation",
        "alt-of"
      ]
    },
    {
      "alt_of": [
        {
          "extra": "an inexperienced player or noob",
          "word": "bad kid"
        }
      ],
      "categories": [
        "English initialisms",
        "English slang",
        "en:Video games"
      ],
      "glosses": [
        "Initialism of bad kid, an inexperienced player or noob."
      ],
      "links": [
        [
          "video game",
          "video game"
        ],
        [
          "bad",
          "bad#English"
        ],
        [
          "kid",
          "kid#English"
        ],
        [
          "noob",
          "noob"
        ]
      ],
      "raw_glosses": [
        "(video games, slang) Initialism of bad kid, an inexperienced player or noob."
      ],
      "tags": [
        "abbreviation",
        "alt-of",
        "initialism",
        "slang"
      ],
      "topics": [
        "video-games"
      ]
    }
  ],
  "word": "bk"
}