"by day" meaning in English

{
  "head_templates": [
    {
      "args": {
        "1": "en",
        "2": "prepositional phrase",
        "head": ""
      },
      "expansion": "by day",
      "name": "head"
    },
    {
      "args": {},
      "expansion": "by day",
      "name": "en-PP"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "prep_phrase",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "He is a policeman by day and a thief by night."
        }
      ],
      "glosses": [
        "During the day."
      ],
      "id": "en-by_day-en-prep_phrase-m3aL-bcZ",
      "related": [
        {
          "word": "by night"
        }
      ],
      "translations": [
        {
          "code": "eo",
          "lang": "Esperanto",
          "sense": "during the day",
          "word": "tage"
        },
        {
          "code": "fi",
          "lang": "Finnish",
          "sense": "during the day",
          "word": "päivällä"
        },
        {
          "code": "he",
          "lang": "Hebrew",
          "roman": "yomám",
          "sense": "during the day",
          "word": "יוֹמָם"
        },
        {
          "code": "la",
          "lang": "Latin",
          "sense": "during the day",
          "word": "interdiū"
        },
        {
          "code": "pl",
          "lang": "Polish",
          "sense": "during the day",
          "word": "za dnia"
        },
        {
          "code": "pt",
          "lang": "Portuguese",
          "sense": "during the day",
          "word": "de dia"
        },
        {
          "code": "es",
          "lang": "Spanish",
          "sense": "during the day",
          "word": "de día"
        },
        {
          "code": "txb",
          "lang": "Tocharian B",
          "sense": "during the day",
          "word": "iṅkauṃ"
        }
      ]
    }
  ],
  "word": "by day"
}

{
  "head_templates": [
    {
      "args": {
        "1": "en",
        "2": "prepositional phrase",
        "head": ""
      },
      "expansion": "by day",
      "name": "head"
    },
    {
      "args": {},
      "expansion": "by day",
      "name": "en-PP"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "prep_phrase",
  "related": [
    {
      "word": "by night"
    }
  ],
  "senses": [
    {
      "categories": [
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English prepositional phrases"
      ],
      "examples": [
        {
          "text": "He is a policeman by day and a thief by night."
        }
      ],
      "glosses": [
        "During the day."
      ]
    }
  ],
  "translations": [
    {
      "code": "eo",
      "lang": "Esperanto",
      "sense": "during the day",
      "word": "tage"
    },
    {
      "code": "fi",
      "lang": "Finnish",
      "sense": "during the day",
      "word": "päivällä"
    },
    {
      "code": "he",
      "lang": "Hebrew",
      "roman": "yomám",
      "sense": "during the day",
      "word": "יוֹמָם"
    },
    {
      "code": "la",
      "lang": "Latin",
      "sense": "during the day",
      "word": "interdiū"
    },
    {
      "code": "pl",
      "lang": "Polish",
      "sense": "during the day",
      "word": "za dnia"
    },
    {
      "code": "pt",
      "lang": "Portuguese",
      "sense": "during the day",
      "word": "de dia"
    },
    {
      "code": "es",
      "lang": "Spanish",
      "sense": "during the day",
      "word": "de día"
    },
    {
      "code": "txb",
      "lang": "Tocharian B",
      "sense": "during the day",
      "word": "iṅkauṃ"
    }
  ],
  "word": "by day"
}