"up on" meaning in English

{
  "forms": [
    {
      "form": "more up on",
      "tags": [
        "comparative"
      ]
    },
    {
      "form": "most up on",
      "tags": [
        "superlative"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "-",
        "2": "more"
      },
      "expansion": "up on (not generally comparable, comparative more up on, superlative most up on)",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "The tour guide was certainly up on his history."
        },
        {
          "ref": "1986, Aliens",
          "text": "Maybe you aren't up on current events, but we just got our asses kicked, pal",
          "type": "quotation"
        },
        {
          "ref": "2001 June 24, Christopher John Farley, “The New Video Wizards”, in Time",
          "text": "Says Sigismondi: \"I don't watch [MTV]. I'm really not up on what's trendy.\"",
          "type": "quotation"
        },
        {
          "ref": "2011 August 25, William Grimes, “Casey Ribicoff, Senator’s Widow and a Style Leader, Dies at 88”, in New York Times, retrieved 2012-01-03",
          "text": "“She was up on everything,” said the biographer A. Scott Berg. “Not just the news but every play or film or book.”",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Well-informed concerning."
      ],
      "id": "en-up_on-en-adj-GZgJdMg7",
      "links": [
        [
          "Well-informed",
          "well-informed"
        ]
      ],
      "raw_glosses": [
        "(idiomatic, colloquial) Well-informed concerning."
      ],
      "tags": [
        "colloquial",
        "idiomatic",
        "not-comparable",
        "usually"
      ]
    }
  ],
  "sounds": [
    {
      "audio": "En-au-up on.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/9/93/En-au-up_on.ogg/En-au-up_on.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/9/93/En-au-up_on.ogg",
      "tags": [
        "Australia"
      ],
      "text": "Audio (AU)"
    }
  ],
  "word": "up on"
}

{
  "forms": [
    {
      "form": "more up on",
      "tags": [
        "comparative"
      ]
    },
    {
      "form": "most up on",
      "tags": [
        "superlative"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "-",
        "2": "more"
      },
      "expansion": "up on (not generally comparable, comparative more up on, superlative most up on)",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        "English adjectives",
        "English colloquialisms",
        "English entries with incorrect language header",
        "English idioms",
        "English lemmas",
        "English multiword terms",
        "English terms with audio links",
        "English terms with quotations"
      ],
      "examples": [
        {
          "text": "The tour guide was certainly up on his history."
        },
        {
          "ref": "1986, Aliens",
          "text": "Maybe you aren't up on current events, but we just got our asses kicked, pal",
          "type": "quotation"
        },
        {
          "ref": "2001 June 24, Christopher John Farley, “The New Video Wizards”, in Time",
          "text": "Says Sigismondi: \"I don't watch [MTV]. I'm really not up on what's trendy.\"",
          "type": "quotation"
        },
        {
          "ref": "2011 August 25, William Grimes, “Casey Ribicoff, Senator’s Widow and a Style Leader, Dies at 88”, in New York Times, retrieved 2012-01-03",
          "text": "“She was up on everything,” said the biographer A. Scott Berg. “Not just the news but every play or film or book.”",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Well-informed concerning."
      ],
      "links": [
        [
          "Well-informed",
          "well-informed"
        ]
      ],
      "raw_glosses": [
        "(idiomatic, colloquial) Well-informed concerning."
      ],
      "tags": [
        "colloquial",
        "idiomatic",
        "not-comparable",
        "usually"
      ]
    }
  ],
  "sounds": [
    {
      "audio": "En-au-up on.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/9/93/En-au-up_on.ogg/En-au-up_on.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/9/93/En-au-up_on.ogg",
      "tags": [
        "Australia"
      ],
      "text": "Audio (AU)"
    }
  ],
  "word": "up on"
}