"let on" meaning in English

{
  "forms": [
    {
      "form": "lets on",
      "tags": [
        "present",
        "singular",
        "third-person"
      ]
    },
    {
      "form": "letting on",
      "tags": [
        "participle",
        "present"
      ]
    },
    {
      "form": "let on",
      "tags": [
        "participle",
        "past"
      ]
    },
    {
      "form": "let on",
      "tags": [
        "past"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "let<,,let> on"
      },
      "expansion": "let on (third-person singular simple present lets on, present participle letting on, simple past and past participle let on)",
      "name": "en-verb"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "verb",
  "senses": [
    {
      "categories": [],
      "examples": [
        {
          "text": "The bus is full now. I can't let any more people on.",
          "type": "example"
        }
      ],
      "glosses": [
        "Used other than figuratively or idiomatically: see let, on."
      ],
      "id": "en-let_on-en-verb-K0jZAfkB",
      "links": [
        [
          "let",
          "let#English"
        ],
        [
          "on",
          "on#English"
        ]
      ],
      "synonyms": [
        {
          "_dis1": "95 5",
          "word": "disclose"
        },
        {
          "_dis1": "95 5",
          "word": "divulge"
        },
        {
          "_dis1": "95 5",
          "word": "give away"
        }
      ]
    },
    {
      "categories": [
        {
          "_dis": "34 66",
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "34 66",
          "kind": "other",
          "name": "English phrasal verbs with particle (on)",
          "parents": [],
          "source": "w+disamb"
        }
      ],
      "examples": [
        {
          "text": "I tried not to let on that I had already guessed the answer.",
          "type": "example"
        },
        {
          "text": "He's more self-centered than he lets on.",
          "type": "example"
        }
      ],
      "glosses": [
        "to reveal or indicate, especially unintentionally or against one's wishes"
      ],
      "id": "en-let_on-en-verb-dMkweafp",
      "links": [
        [
          "reveal",
          "reveal"
        ],
        [
          "indicate",
          "indicate"
        ]
      ],
      "raw_glosses": [
        "(idiomatic) to reveal or indicate, especially unintentionally or against one's wishes"
      ],
      "tags": [
        "idiomatic"
      ]
    }
  ],
  "sounds": [
    {
      "audio": "En-au-let on.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/b/bd/En-au-let_on.ogg/En-au-let_on.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/b/bd/En-au-let_on.ogg",
      "tags": [
        "Australia"
      ],
      "text": "Audio (AU)"
    }
  ],
  "word": "let on"
}

{
  "categories": [
    "English entries with incorrect language header",
    "English lemmas",
    "English multiword terms",
    "English phrasal verbs",
    "English phrasal verbs with particle (on)",
    "English terms with audio links",
    "English verbs"
  ],
  "forms": [
    {
      "form": "lets on",
      "tags": [
        "present",
        "singular",
        "third-person"
      ]
    },
    {
      "form": "letting on",
      "tags": [
        "participle",
        "present"
      ]
    },
    {
      "form": "let on",
      "tags": [
        "participle",
        "past"
      ]
    },
    {
      "form": "let on",
      "tags": [
        "past"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "let<,,let> on"
      },
      "expansion": "let on (third-person singular simple present lets on, present participle letting on, simple past and past participle let on)",
      "name": "en-verb"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "verb",
  "senses": [
    {
      "categories": [
        "English terms with usage examples"
      ],
      "examples": [
        {
          "text": "The bus is full now. I can't let any more people on.",
          "type": "example"
        }
      ],
      "glosses": [
        "Used other than figuratively or idiomatically: see let, on."
      ],
      "links": [
        [
          "let",
          "let#English"
        ],
        [
          "on",
          "on#English"
        ]
      ]
    },
    {
      "categories": [
        "English idioms",
        "English terms with usage examples"
      ],
      "examples": [
        {
          "text": "I tried not to let on that I had already guessed the answer.",
          "type": "example"
        },
        {
          "text": "He's more self-centered than he lets on.",
          "type": "example"
        }
      ],
      "glosses": [
        "to reveal or indicate, especially unintentionally or against one's wishes"
      ],
      "links": [
        [
          "reveal",
          "reveal"
        ],
        [
          "indicate",
          "indicate"
        ]
      ],
      "raw_glosses": [
        "(idiomatic) to reveal or indicate, especially unintentionally or against one's wishes"
      ],
      "tags": [
        "idiomatic"
      ]
    }
  ],
  "sounds": [
    {
      "audio": "En-au-let on.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/b/bd/En-au-let_on.ogg/En-au-let_on.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/b/bd/En-au-let_on.ogg",
      "tags": [
        "Australia"
      ],
      "text": "Audio (AU)"
    }
  ],
  "synonyms": [
    {
      "word": "disclose"
    },
    {
      "word": "divulge"
    },
    {
      "word": "give away"
    }
  ],
  "word": "let on"
}