"night fly" meaning in English

{
  "forms": [
    {
      "form": "night flies",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "night fly (plural night flies)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "1888, John Bickerdyke, Flyfishing for Mullet",
          "text": "At night the fly fisher stands a better chance, and will now and again take a few fish on a white moth. The dressing of a night fly for mullet was described in the following letter, […]",
          "type": "quotation"
        }
      ],
      "glosses": [
        "A moth that flies at night."
      ],
      "id": "en-night_fly-en-noun-zyvFBnbt",
      "links": [
        [
          "moth",
          "moth"
        ]
      ],
      "raw_glosses": [
        "(archaic) A moth that flies at night."
      ],
      "related": [
        {
          "word": "fly-by-night"
        }
      ],
      "tags": [
        "archaic"
      ]
    }
  ],
  "word": "night fly"
}

{
  "forms": [
    {
      "form": "night flies",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "night fly (plural night flies)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "fly-by-night"
    }
  ],
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with archaic senses",
        "English terms with quotations",
        "Quotation templates to be cleaned"
      ],
      "examples": [
        {
          "ref": "1888, John Bickerdyke, Flyfishing for Mullet",
          "text": "At night the fly fisher stands a better chance, and will now and again take a few fish on a white moth. The dressing of a night fly for mullet was described in the following letter, […]",
          "type": "quotation"
        }
      ],
      "glosses": [
        "A moth that flies at night."
      ],
      "links": [
        [
          "moth",
          "moth"
        ]
      ],
      "raw_glosses": [
        "(archaic) A moth that flies at night."
      ],
      "tags": [
        "archaic"
      ]
    }
  ],
  "word": "night fly"
}