"ad kalendas Graecas" meaning in Latin

{
  "descendants": [
    {
      "depth": 1,
      "templates": [
        {
          "args": {
            "1": "en",
            "2": "Greek calends",
            "cal": "1"
          },
          "expansion": "→ English: Greek calends (calque)",
          "name": "desc"
        }
      ],
      "text": "→ English: Greek calends (calque)"
    },
    {
      "depth": 1,
      "templates": [
        {
          "args": {
            "1": "fr",
            "2": "aux calendes grecques",
            "cal": "1"
          },
          "expansion": "→ French: aux calendes grecques (calque)",
          "name": "desc"
        }
      ],
      "text": "→ French: aux calendes grecques (calque)"
    },
    {
      "depth": 1,
      "templates": [
        {
          "args": {
            "1": "it",
            "2": "alle calende greche",
            "cal": "1"
          },
          "expansion": "→ Italian: alle calende greche (calque)",
          "name": "desc"
        }
      ],
      "text": "→ Italian: alle calende greche (calque)"
    }
  ],
  "etymology_text": "Attributed by Suetonius in Lives of the Twelve Caesars to Caesar Augustus. The kalends (also written calends) were specific days of the Roman calendar (the first of the month), not of the Greek, and so the “Greek Kalends” would never occur.",
  "forms": [
    {
      "form": "ad kalendās Graecās",
      "tags": [
        "canonical"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "la",
        "2": "phrase",
        "head": "ad kalendās Graecās"
      },
      "expansion": "ad kalendās Graecās",
      "name": "head"
    }
  ],
  "lang": "Latin",
  "lang_code": "la",
  "pos": "phrase",
  "senses": [
    {
      "categories": [],
      "glosses": [
        "never at all; never in a month of Sundays."
      ],
      "id": "en-ad_kalendas_Graecas-la-phrase-zPNoRl5y",
      "links": [
        [
          "never",
          "never"
        ],
        [
          "at all",
          "at all"
        ],
        [
          "never in a month of Sundays",
          "never in a month of Sundays"
        ]
      ],
      "raw_glosses": [
        "(idiomatic) never at all; never in a month of Sundays."
      ],
      "tags": [
        "idiomatic"
      ],
      "wikipedia": [
        "Attic calendar",
        "Caesar Augustus",
        "Roman calendar",
        "Suetonius",
        "The Twelve Caesars"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ad kaˈlen.daːs ˈɡrae̯.kaːs/",
      "tags": [
        "Classical"
      ]
    },
    {
      "ipa": "[äd̪ käˈɫ̪ɛn̪d̪äːs̠ ˈɡräe̯käːs̠]",
      "tags": [
        "Classical"
      ]
    },
    {
      "ipa": "/ad kaˈlen.das ˈɡre.kas/",
      "note": "modern Italianate Ecclesiastical"
    },
    {
      "ipa": "[äd̪ käˈlɛn̪d̪äs ˈɡrɛːkäs]",
      "note": "modern Italianate Ecclesiastical"
    }
  ],
  "word": "ad kalendas Graecas"
}

{
  "descendants": [
    {
      "depth": 1,
      "templates": [
        {
          "args": {
            "1": "en",
            "2": "Greek calends",
            "cal": "1"
          },
          "expansion": "→ English: Greek calends (calque)",
          "name": "desc"
        }
      ],
      "text": "→ English: Greek calends (calque)"
    },
    {
      "depth": 1,
      "templates": [
        {
          "args": {
            "1": "fr",
            "2": "aux calendes grecques",
            "cal": "1"
          },
          "expansion": "→ French: aux calendes grecques (calque)",
          "name": "desc"
        }
      ],
      "text": "→ French: aux calendes grecques (calque)"
    },
    {
      "depth": 1,
      "templates": [
        {
          "args": {
            "1": "it",
            "2": "alle calende greche",
            "cal": "1"
          },
          "expansion": "→ Italian: alle calende greche (calque)",
          "name": "desc"
        }
      ],
      "text": "→ Italian: alle calende greche (calque)"
    }
  ],
  "etymology_text": "Attributed by Suetonius in Lives of the Twelve Caesars to Caesar Augustus. The kalends (also written calends) were specific days of the Roman calendar (the first of the month), not of the Greek, and so the “Greek Kalends” would never occur.",
  "forms": [
    {
      "form": "ad kalendās Graecās",
      "tags": [
        "canonical"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "la",
        "2": "phrase",
        "head": "ad kalendās Graecās"
      },
      "expansion": "ad kalendās Graecās",
      "name": "head"
    }
  ],
  "lang": "Latin",
  "lang_code": "la",
  "pos": "phrase",
  "senses": [
    {
      "categories": [
        "Latin idioms",
        "Latin lemmas",
        "Latin multiword terms",
        "Latin phrases",
        "Latin terms spelled with K",
        "Latin terms with IPA pronunciation"
      ],
      "glosses": [
        "never at all; never in a month of Sundays."
      ],
      "links": [
        [
          "never",
          "never"
        ],
        [
          "at all",
          "at all"
        ],
        [
          "never in a month of Sundays",
          "never in a month of Sundays"
        ]
      ],
      "raw_glosses": [
        "(idiomatic) never at all; never in a month of Sundays."
      ],
      "tags": [
        "idiomatic"
      ],
      "wikipedia": [
        "Attic calendar",
        "Caesar Augustus",
        "Roman calendar",
        "Suetonius",
        "The Twelve Caesars"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ad kaˈlen.daːs ˈɡrae̯.kaːs/",
      "tags": [
        "Classical"
      ]
    },
    {
      "ipa": "[äd̪ käˈɫ̪ɛn̪d̪äːs̠ ˈɡräe̯käːs̠]",
      "tags": [
        "Classical"
      ]
    },
    {
      "ipa": "/ad kaˈlen.das ˈɡre.kas/",
      "note": "modern Italianate Ecclesiastical"
    },
    {
      "ipa": "[äd̪ käˈlɛn̪d̪äs ˈɡrɛːkäs]",
      "note": "modern Italianate Ecclesiastical"
    }
  ],
  "word": "ad kalendas Graecas"
}