"quarter of" meaning in English

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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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          "orig": "en:Time",
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      "examples": [
        {
          "text": "\"It's 2:30 now; let's meet in 15 minutes.\" \"Okay, see you at quarter of.\""
        }
      ],
      "glosses": [
        "Synonym of quarter to; fifteen minutes before a certain hour."
      ],
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      "raw_glosses": [
        "(dated) Synonym of quarter to; fifteen minutes before a certain hour."
      ],
      "related": [
        {
          "word": "half past"
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      "synonyms": [
        {
          "extra": "fifteen minutes before a certain hour",
          "tags": [
            "synonym",
            "synonym-of"
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          "word": "quarter to"
        }
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        "dated",
        "uncountable"
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      "audio": "En-au-quarter of.ogg",
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  "word": "quarter of"
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  "lang_code": "en",
  "pos": "noun",
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      "examples": [
        {
          "text": "\"It's 2:30 now; let's meet in 15 minutes.\" \"Okay, see you at quarter of.\""
        }
      ],
      "glosses": [
        "Synonym of quarter to; fifteen minutes before a certain hour."
      ],
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      "raw_glosses": [
        "(dated) Synonym of quarter to; fifteen minutes before a certain hour."
      ],
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          "word": "quarter to"
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  "word": "quarter of"
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