"fall upon" meaning in English

{
  "forms": [
    {
      "form": "falls upon",
      "tags": [
        "present",
        "singular",
        "third-person"
      ]
    },
    {
      "form": "falling upon",
      "tags": [
        "participle",
        "present"
      ]
    },
    {
      "form": "fell upon",
      "tags": [
        "past"
      ]
    },
    {
      "form": "fallen upon",
      "tags": [
        "participle",
        "past"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "fall<,,fell,fallen> upon"
      },
      "expansion": "fall upon (third-person singular simple present falls upon, present participle falling upon, simple past fell upon, past participle fallen upon)",
      "name": "en-verb"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "verb",
  "senses": [
    {
      "categories": [],
      "examples": [
        {
          "text": "With the rise of the Internet, some media fell upon hard times.",
          "type": "example"
        }
      ],
      "glosses": [
        "to experience; to suffer."
      ],
      "id": "en-fall_upon-en-verb-XuM4eQ4I",
      "links": [
        [
          "experience",
          "experience"
        ],
        [
          "suffer",
          "suffer"
        ]
      ]
    },
    {
      "categories": [
        {
          "_dis": "2 81 17",
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "5 58 37",
          "kind": "other",
          "name": "English phrasal verbs with particle (upon)",
          "parents": [],
          "source": "w+disamb"
        }
      ],
      "examples": [
        {
          "ref": "1925, Charles Henry Brewitt-Taylor, chapter 1, in Romance of the Three Kingdoms",
          "text": "It fell upon the day of full moon of the fourth month, the second year, in the era of Established Calm (AD 168), that Emperor Ling went in state to the Hall of Virtue.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "to occur at some particular point in time."
      ],
      "id": "en-fall_upon-en-verb-0mDifF7M",
      "links": [
        [
          "occur",
          "occur"
        ],
        [
          "some",
          "some"
        ],
        [
          "particular",
          "particular"
        ],
        [
          "point",
          "point"
        ],
        [
          "time",
          "time"
        ]
      ]
    },
    {
      "glosses": [
        "to set upon; to attack suddenly"
      ],
      "id": "en-fall_upon-en-verb-BmyBv-DV",
      "links": [
        [
          "set upon",
          "set upon"
        ],
        [
          "attack",
          "attack"
        ]
      ],
      "synonyms": [
        {
          "_dis1": "0 1 99",
          "word": "fall on"
        }
      ],
      "translations": [
        {
          "_dis1": "2 6 92",
          "code": "got",
          "lang": "Gothic",
          "roman": "disdriusan",
          "sense": "to set upon, attack suddenly",
          "word": "𐌳𐌹𐍃𐌳𐍂𐌹𐌿𐍃𐌰𐌽"
        },
        {
          "_dis1": "2 6 92",
          "code": "la",
          "lang": "Latin",
          "sense": "to set upon, attack suddenly",
          "word": "incessō"
        }
      ]
    }
  ],
  "word": "fall upon"
}

{
  "categories": [
    "English entries with incorrect language header",
    "English lemmas",
    "English multiword terms",
    "English phrasal verbs",
    "English phrasal verbs with particle (upon)",
    "English verbs"
  ],
  "forms": [
    {
      "form": "falls upon",
      "tags": [
        "present",
        "singular",
        "third-person"
      ]
    },
    {
      "form": "falling upon",
      "tags": [
        "participle",
        "present"
      ]
    },
    {
      "form": "fell upon",
      "tags": [
        "past"
      ]
    },
    {
      "form": "fallen upon",
      "tags": [
        "participle",
        "past"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "fall<,,fell,fallen> upon"
      },
      "expansion": "fall upon (third-person singular simple present falls upon, present participle falling upon, simple past fell upon, past participle fallen upon)",
      "name": "en-verb"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "verb",
  "senses": [
    {
      "categories": [
        "English terms with usage examples"
      ],
      "examples": [
        {
          "text": "With the rise of the Internet, some media fell upon hard times.",
          "type": "example"
        }
      ],
      "glosses": [
        "to experience; to suffer."
      ],
      "links": [
        [
          "experience",
          "experience"
        ],
        [
          "suffer",
          "suffer"
        ]
      ]
    },
    {
      "categories": [
        "English terms with quotations"
      ],
      "examples": [
        {
          "ref": "1925, Charles Henry Brewitt-Taylor, chapter 1, in Romance of the Three Kingdoms",
          "text": "It fell upon the day of full moon of the fourth month, the second year, in the era of Established Calm (AD 168), that Emperor Ling went in state to the Hall of Virtue.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "to occur at some particular point in time."
      ],
      "links": [
        [
          "occur",
          "occur"
        ],
        [
          "some",
          "some"
        ],
        [
          "particular",
          "particular"
        ],
        [
          "point",
          "point"
        ],
        [
          "time",
          "time"
        ]
      ]
    },
    {
      "glosses": [
        "to set upon; to attack suddenly"
      ],
      "links": [
        [
          "set upon",
          "set upon"
        ],
        [
          "attack",
          "attack"
        ]
      ]
    }
  ],
  "synonyms": [
    {
      "word": "fall on"
    }
  ],
  "translations": [
    {
      "code": "got",
      "lang": "Gothic",
      "roman": "disdriusan",
      "sense": "to set upon, attack suddenly",
      "word": "𐌳𐌹𐍃𐌳𐍂𐌹𐌿𐍃𐌰𐌽"
    },
    {
      "code": "la",
      "lang": "Latin",
      "sense": "to set upon, attack suddenly",
      "word": "incessō"
    }
  ],
  "word": "fall upon"
}