"in on" meaning in English

{
  "head_templates": [
    {
      "args": {
        "1": "en",
        "2": "prepositions",
        "head": ""
      },
      "expansion": "in on",
      "name": "head"
    },
    {
      "args": {},
      "expansion": "in on",
      "name": "en-prep"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "prep",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Egyptian Arabic terms with redundant script codes",
          "parents": [
            "Terms with redundant script codes",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English prepositions",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "She was in on the surprise from the beginning."
        },
        {
          "text": "We had to let him in on it after he overheard some of us talking."
        }
      ],
      "glosses": [
        "Part of or privy to; involved in (something private, especially a plan or plot)."
      ],
      "id": "en-in_on-en-prep-q9G-YYfB",
      "links": [
        [
          "privy",
          "privy"
        ],
        [
          "involved",
          "involved"
        ]
      ],
      "translations": [
        {
          "code": "ar",
          "lang": "Arabic",
          "roman": "juzʔan min",
          "sense": "Part of or privy to",
          "word": "جُزْءً مِن"
        },
        {
          "code": "arz",
          "lang": "Arabic",
          "roman": "gozʔ men",
          "sense": "Part of or privy to",
          "tags": [
            "Egyptian-Arabic"
          ],
          "word": "جزء من"
        },
        {
          "alt": "(sīxià)zhīqíng",
          "code": "cmn",
          "lang": "Chinese Mandarin",
          "sense": "Part of or privy to",
          "word": "（私下）知情"
        },
        {
          "code": "no",
          "english": "part of",
          "lang": "Norwegian",
          "sense": "Part of or privy to",
          "word": "med på"
        },
        {
          "code": "no",
          "english": "privy to",
          "lang": "Norwegian",
          "sense": "Part of or privy to",
          "word": "gjøre kjent med"
        },
        {
          "code": "es",
          "lang": "Spanish",
          "sense": "Part of or privy to",
          "word": "parte de"
        }
      ]
    }
  ],
  "word": "in on"
}

{
  "head_templates": [
    {
      "args": {
        "1": "en",
        "2": "prepositions",
        "head": ""
      },
      "expansion": "in on",
      "name": "head"
    },
    {
      "args": {},
      "expansion": "in on",
      "name": "en-prep"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "prep",
  "senses": [
    {
      "categories": [
        "Egyptian Arabic terms with redundant script codes",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English prepositions"
      ],
      "examples": [
        {
          "text": "She was in on the surprise from the beginning."
        },
        {
          "text": "We had to let him in on it after he overheard some of us talking."
        }
      ],
      "glosses": [
        "Part of or privy to; involved in (something private, especially a plan or plot)."
      ],
      "links": [
        [
          "privy",
          "privy"
        ],
        [
          "involved",
          "involved"
        ]
      ]
    }
  ],
  "translations": [
    {
      "code": "ar",
      "lang": "Arabic",
      "roman": "juzʔan min",
      "sense": "Part of or privy to",
      "word": "جُزْءً مِن"
    },
    {
      "code": "arz",
      "lang": "Arabic",
      "roman": "gozʔ men",
      "sense": "Part of or privy to",
      "tags": [
        "Egyptian-Arabic"
      ],
      "word": "جزء من"
    },
    {
      "alt": "(sīxià)zhīqíng",
      "code": "cmn",
      "lang": "Chinese Mandarin",
      "sense": "Part of or privy to",
      "word": "（私下）知情"
    },
    {
      "code": "no",
      "english": "part of",
      "lang": "Norwegian",
      "sense": "Part of or privy to",
      "word": "med på"
    },
    {
      "code": "no",
      "english": "privy to",
      "lang": "Norwegian",
      "sense": "Part of or privy to",
      "word": "gjøre kjent med"
    },
    {
      "code": "es",
      "lang": "Spanish",
      "sense": "Part of or privy to",
      "word": "parte de"
    }
  ],
  "word": "in on"
}