"know what is what" meaning in English

{
  "forms": [
    {
      "form": "knows what is what",
      "tags": [
        "present",
        "singular",
        "third-person"
      ]
    },
    {
      "form": "knowing what is what",
      "tags": [
        "participle",
        "present"
      ]
    },
    {
      "form": "knew what was what",
      "tags": [
        "past"
      ]
    },
    {
      "form": "known what was what",
      "tags": [
        "participle",
        "past"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "know<,,knew,known> what is<is,is,was> what",
        "head": "know what is what"
      },
      "expansion": "know what is what (third-person singular simple present knows what is what, present participle knowing what is what, simple past knew what was what, past participle known what was what)",
      "name": "en-verb"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "verb",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "He seems to have no trouble understanding stuff that, to me, sounds like hot garbage. He really does know what's what.",
          "type": "example"
        },
        {
          "text": "She said she was going to house to study French, but I wasn't born yesterday. I know what's what.",
          "type": "example"
        },
        {
          "text": "Everything is changing so fast... I just don't know what's what anymore!",
          "type": "example"
        }
      ],
      "glosses": [
        "To understand the current situation; to know what is going on."
      ],
      "id": "en-know_what_is_what-en-verb-StHupdrM",
      "links": [
        [
          "situation",
          "situation"
        ],
        [
          "going on",
          "go on"
        ]
      ],
      "raw_glosses": [
        "(idiomatic) To understand the current situation; to know what is going on."
      ],
      "related": [
        {
          "word": "know what one is about"
        }
      ],
      "synonyms": [
        {
          "word": "know what's what"
        }
      ],
      "tags": [
        "idiomatic"
      ],
      "translations": [
        {
          "code": "fi",
          "lang": "Finnish",
          "sense": "Translations",
          "word": "tietää mikä on mitäkin"
        },
        {
          "code": "it",
          "lang": "Italian",
          "sense": "Translations",
          "word": "sapere il fatto proprio"
        }
      ]
    }
  ],
  "sounds": [
    {
      "audio": "En-au-know what is what.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/5/58/En-au-know_what_is_what.ogg/En-au-know_what_is_what.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/5/58/En-au-know_what_is_what.ogg",
      "tags": [
        "Australia"
      ],
      "text": "Audio (AU)"
    }
  ],
  "word": "know what is what"
}

{
  "forms": [
    {
      "form": "knows what is what",
      "tags": [
        "present",
        "singular",
        "third-person"
      ]
    },
    {
      "form": "knowing what is what",
      "tags": [
        "participle",
        "present"
      ]
    },
    {
      "form": "knew what was what",
      "tags": [
        "past"
      ]
    },
    {
      "form": "known what was what",
      "tags": [
        "participle",
        "past"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "know<,,knew,known> what is<is,is,was> what",
        "head": "know what is what"
      },
      "expansion": "know what is what (third-person singular simple present knows what is what, present participle knowing what is what, simple past knew what was what, past participle known what was what)",
      "name": "en-verb"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "verb",
  "related": [
    {
      "word": "know what one is about"
    }
  ],
  "senses": [
    {
      "categories": [
        "English entries with incorrect language header",
        "English idioms",
        "English lemmas",
        "English multiword terms",
        "English terms with audio links",
        "English terms with usage examples",
        "English verbs",
        "Translation table header lacks gloss"
      ],
      "examples": [
        {
          "text": "He seems to have no trouble understanding stuff that, to me, sounds like hot garbage. He really does know what's what.",
          "type": "example"
        },
        {
          "text": "She said she was going to house to study French, but I wasn't born yesterday. I know what's what.",
          "type": "example"
        },
        {
          "text": "Everything is changing so fast... I just don't know what's what anymore!",
          "type": "example"
        }
      ],
      "glosses": [
        "To understand the current situation; to know what is going on."
      ],
      "links": [
        [
          "situation",
          "situation"
        ],
        [
          "going on",
          "go on"
        ]
      ],
      "raw_glosses": [
        "(idiomatic) To understand the current situation; to know what is going on."
      ],
      "tags": [
        "idiomatic"
      ]
    }
  ],
  "sounds": [
    {
      "audio": "En-au-know what is what.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/5/58/En-au-know_what_is_what.ogg/En-au-know_what_is_what.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/5/58/En-au-know_what_is_what.ogg",
      "tags": [
        "Australia"
      ],
      "text": "Audio (AU)"
    }
  ],
  "synonyms": [
    {
      "word": "know what's what"
    }
  ],
  "translations": [
    {
      "code": "fi",
      "lang": "Finnish",
      "sense": "Translations",
      "word": "tietää mikä on mitäkin"
    },
    {
      "code": "it",
      "lang": "Italian",
      "sense": "Translations",
      "word": "sapere il fatto proprio"
    }
  ],
  "word": "know what is what"
}