"tumble on" meaning in English

{
  "forms": [
    {
      "form": "tumbles on",
      "tags": [
        "present",
        "singular",
        "third-person"
      ]
    },
    {
      "form": "tumbling on",
      "tags": [
        "participle",
        "present"
      ]
    },
    {
      "form": "tumbled on",
      "tags": [
        "participle",
        "past"
      ]
    },
    {
      "form": "tumbled on",
      "tags": [
        "past"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "*"
      },
      "expansion": "tumble on (third-person singular simple present tumbles on, present participle tumbling on, simple past and past participle tumbled on)",
      "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"
        },
        {
          "kind": "other",
          "name": "English phrasal verbs formed with \"on\"",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "1910, Edith Wharton, “The Bolted Door”, in Tales of Men and Ghosts, New York: Scribner, page 69",
          "text": "He murdered the man all right. I tumbled on the truth by the merest accident, when I’d pretty nearly chucked the whole job.",
          "type": "quotation"
        },
        {
          "text": "1931, E. Phillips Oppenheim, “What Sir Stephen Forgot” in Sinners Beware, Boston: Little, Brown & Co., 1932, p. 158, (first published as “In the Strongroom” in Collier’s Weekly, 11 April, 1931),\n“If it isn’t Peter Hames?” he cried. “God bless my soul! They told us over in New York that you were living in these parts, but to tumble on you like this! Why, we only landed here two minutes ago. I call this fine.”"
        }
      ],
      "glosses": [
        "To accidentally encounter (a person or situation)."
      ],
      "id": "en-tumble_on-en-verb-Jl2BaE2Q",
      "links": [
        [
          "accidentally",
          "accidentally"
        ],
        [
          "encounter",
          "encounter"
        ]
      ],
      "raw_glosses": [
        "(transitive, idiomatic) To accidentally encounter (a person or situation)."
      ],
      "synonyms": [
        {
          "word": "chance upon"
        },
        {
          "word": "happen upon"
        },
        {
          "word": "stumble across"
        }
      ],
      "tags": [
        "idiomatic",
        "transitive"
      ]
    }
  ],
  "sounds": [
    {
      "audio": "En-au-tumble on.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/f/fc/En-au-tumble_on.ogg/En-au-tumble_on.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/f/fc/En-au-tumble_on.ogg"
    }
  ],
  "word": "tumble on"
}

{
  "forms": [
    {
      "form": "tumbles on",
      "tags": [
        "present",
        "singular",
        "third-person"
      ]
    },
    {
      "form": "tumbling on",
      "tags": [
        "participle",
        "present"
      ]
    },
    {
      "form": "tumbled on",
      "tags": [
        "participle",
        "past"
      ]
    },
    {
      "form": "tumbled on",
      "tags": [
        "past"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "*"
      },
      "expansion": "tumble on (third-person singular simple present tumbles on, present participle tumbling on, simple past and past participle tumbled on)",
      "name": "en-verb"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "verb",
  "senses": [
    {
      "categories": [
        "English entries with incorrect language header",
        "English idioms",
        "English lemmas",
        "English multiword terms",
        "English phrasal verbs",
        "English phrasal verbs formed with \"on\"",
        "English terms with audio links",
        "English terms with quotations",
        "English transitive verbs",
        "English verbs",
        "Quotation templates to be cleaned"
      ],
      "examples": [
        {
          "ref": "1910, Edith Wharton, “The Bolted Door”, in Tales of Men and Ghosts, New York: Scribner, page 69",
          "text": "He murdered the man all right. I tumbled on the truth by the merest accident, when I’d pretty nearly chucked the whole job.",
          "type": "quotation"
        },
        {
          "text": "1931, E. Phillips Oppenheim, “What Sir Stephen Forgot” in Sinners Beware, Boston: Little, Brown & Co., 1932, p. 158, (first published as “In the Strongroom” in Collier’s Weekly, 11 April, 1931),\n“If it isn’t Peter Hames?” he cried. “God bless my soul! They told us over in New York that you were living in these parts, but to tumble on you like this! Why, we only landed here two minutes ago. I call this fine.”"
        }
      ],
      "glosses": [
        "To accidentally encounter (a person or situation)."
      ],
      "links": [
        [
          "accidentally",
          "accidentally"
        ],
        [
          "encounter",
          "encounter"
        ]
      ],
      "raw_glosses": [
        "(transitive, idiomatic) To accidentally encounter (a person or situation)."
      ],
      "tags": [
        "idiomatic",
        "transitive"
      ]
    }
  ],
  "sounds": [
    {
      "audio": "En-au-tumble on.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/f/fc/En-au-tumble_on.ogg/En-au-tumble_on.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/f/fc/En-au-tumble_on.ogg"
    }
  ],
  "synonyms": [
    {
      "word": "chance upon"
    },
    {
      "word": "happen upon"
    },
    {
      "word": "stumble across"
    }
  ],
  "word": "tumble on"
}