"persist down" meaning in English

{
  "forms": [
    {
      "form": "persists down",
      "tags": [
        "present",
        "singular",
        "third-person"
      ]
    },
    {
      "form": "persisting down",
      "tags": [
        "participle",
        "present"
      ]
    },
    {
      "form": "persisted down",
      "tags": [
        "participle",
        "past"
      ]
    },
    {
      "form": "persisted down",
      "tags": [
        "past"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "*"
      },
      "expansion": "persist down (third-person singular simple present persists down, present participle persisting down, simple past and past participle persisted down)",
      "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 \"down\"",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Humorous euphemism for piss down (rain heavily)."
      ],
      "id": "en-persist_down-en-verb-IDeMXdEV",
      "links": [
        [
          "piss down",
          "piss down#English"
        ]
      ]
    }
  ],
  "word": "persist down"
}

{
  "forms": [
    {
      "form": "persists down",
      "tags": [
        "present",
        "singular",
        "third-person"
      ]
    },
    {
      "form": "persisting down",
      "tags": [
        "participle",
        "present"
      ]
    },
    {
      "form": "persisted down",
      "tags": [
        "participle",
        "past"
      ]
    },
    {
      "form": "persisted down",
      "tags": [
        "past"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "*"
      },
      "expansion": "persist down (third-person singular simple present persists down, present participle persisting down, simple past and past participle persisted down)",
      "name": "en-verb"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "verb",
  "senses": [
    {
      "categories": [
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English phrasal verbs",
        "English phrasal verbs formed with \"down\"",
        "English verbs",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "glosses": [
        "Humorous euphemism for piss down (rain heavily)."
      ],
      "links": [
        [
          "piss down",
          "piss down#English"
        ]
      ]
    }
  ],
  "word": "persist down"
}