"A game" meaning in English

{
  "forms": [
    {
      "form": "A games",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "A game (plural A games)",
      "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": [
        {
          "text": "Joe brought his A game to the match.",
          "type": "example"
        },
        {
          "ref": "2023 November 2, Monisha Holmes, Erika W. Smith, “Read This Before You Ask Out a Taurus Woman”, in Cosmopolitan",
          "text": "If a Taurus isn't able to bring their A-game to social interactions, they'd prefer to stay at home and fix the problem.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "One's highest level of performance; one's best form."
      ],
      "id": "en-A_game-en-noun-cyorcFjw",
      "raw_glosses": [
        "(informal) One's highest level of performance; one's best form."
      ],
      "related": [
        {
          "word": "at one's best"
        }
      ],
      "synonyms": [
        {
          "word": "A-game"
        }
      ],
      "tags": [
        "informal"
      ]
    }
  ],
  "word": "A game"
}

{
  "forms": [
    {
      "form": "A games",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "A game (plural A games)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "at one's best"
    }
  ],
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English informal terms",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with quotations",
        "English terms with usage examples"
      ],
      "examples": [
        {
          "text": "Joe brought his A game to the match.",
          "type": "example"
        },
        {
          "ref": "2023 November 2, Monisha Holmes, Erika W. Smith, “Read This Before You Ask Out a Taurus Woman”, in Cosmopolitan",
          "text": "If a Taurus isn't able to bring their A-game to social interactions, they'd prefer to stay at home and fix the problem.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "One's highest level of performance; one's best form."
      ],
      "raw_glosses": [
        "(informal) One's highest level of performance; one's best form."
      ],
      "tags": [
        "informal"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "A-game"
    }
  ],
  "word": "A game"
}