"go off on one" meaning in English

{
  "forms": [
    {
      "form": "goes off on one",
      "tags": [
        "present",
        "singular",
        "third-person"
      ]
    },
    {
      "form": "going off on one",
      "tags": [
        "participle",
        "present"
      ]
    },
    {
      "form": "went off on one",
      "tags": [
        "past"
      ]
    },
    {
      "form": "gone off on one",
      "tags": [
        "participle",
        "past"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "go<goes,,went,gone> off on one"
      },
      "expansion": "go off on one (third-person singular simple present goes off on one, present participle going off on one, simple past went off on one, past participle gone off on one)",
      "name": "en-verb"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "verb",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "British English",
          "parents": [],
          "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 phrasal verbs with particle (off)",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English phrasal verbs with particle (on)",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "I barely mentioned the band's name before he went off on one about how commercial the top forty is these days.",
          "type": "example"
        },
        {
          "ref": "2021, Andreina Cordani, The Girl Who...",
          "text": "As far as I was concerned, we had a deal – she never went off on one about 'that's not a skirt it's a belt,' and I never went out dressed like a stripper.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "To launch into an animated diatribe, or passionate description or explanation of something."
      ],
      "id": "en-go_off_on_one-en-verb-uPYBz-Ni",
      "links": [
        [
          "diatribe",
          "diatribe"
        ]
      ],
      "raw_glosses": [
        "(British, colloquial) To launch into an animated diatribe, or passionate description or explanation of something."
      ],
      "related": [
        {
          "word": "go off on a tangent"
        }
      ],
      "tags": [
        "British",
        "colloquial"
      ]
    }
  ],
  "word": "go off on one"
}

{
  "forms": [
    {
      "form": "goes off on one",
      "tags": [
        "present",
        "singular",
        "third-person"
      ]
    },
    {
      "form": "going off on one",
      "tags": [
        "participle",
        "present"
      ]
    },
    {
      "form": "went off on one",
      "tags": [
        "past"
      ]
    },
    {
      "form": "gone off on one",
      "tags": [
        "participle",
        "past"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "go<goes,,went,gone> off on one"
      },
      "expansion": "go off on one (third-person singular simple present goes off on one, present participle going off on one, simple past went off on one, past participle gone off on one)",
      "name": "en-verb"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "verb",
  "related": [
    {
      "word": "go off on a tangent"
    }
  ],
  "senses": [
    {
      "categories": [
        "British English",
        "English colloquialisms",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English phrasal verbs",
        "English phrasal verbs with particle (off)",
        "English phrasal verbs with particle (on)",
        "English terms with quotations",
        "English terms with usage examples",
        "English verbs",
        "Quotation templates to be cleaned"
      ],
      "examples": [
        {
          "text": "I barely mentioned the band's name before he went off on one about how commercial the top forty is these days.",
          "type": "example"
        },
        {
          "ref": "2021, Andreina Cordani, The Girl Who...",
          "text": "As far as I was concerned, we had a deal – she never went off on one about 'that's not a skirt it's a belt,' and I never went out dressed like a stripper.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "To launch into an animated diatribe, or passionate description or explanation of something."
      ],
      "links": [
        [
          "diatribe",
          "diatribe"
        ]
      ],
      "raw_glosses": [
        "(British, colloquial) To launch into an animated diatribe, or passionate description or explanation of something."
      ],
      "tags": [
        "British",
        "colloquial"
      ]
    }
  ],
  "word": "go off on one"
}