"robber fly" meaning in English

{
  "forms": [
    {
      "form": "robber flies",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "robber flies"
      },
      "expansion": "robber fly (plural robber flies)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
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        },
        {
          "kind": "lifeform",
          "langcode": "en",
          "name": "Asilomorph flies",
          "orig": "en:Asilomorph flies",
          "parents": [
            "Dipterans",
            "Insects",
            "Arthropods",
            "Animals",
            "Lifeforms",
            "All topics",
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            "Nature"
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      ],
      "glosses": [
        "Any fly of the family Asilidae."
      ],
      "id": "en-robber_fly-en-noun-OwGS96SU",
      "links": [
        [
          "Asilidae",
          "Asilidae#Translingual"
        ]
      ],
      "synonyms": [
        {
          "word": "assassin fly"
        },
        {
          "word": "robberfly"
        },
        {
          "word": "robber-fly"
        }
      ],
      "translations": [
        {
          "code": "pl",
          "lang": "Polish",
          "sense": "any fly of the family Asilidae",
          "tags": [
            "masculine"
          ],
          "word": "łowik"
        },
        {
          "code": "ru",
          "lang": "Russian",
          "roman": "ktyrʹ",
          "sense": "any fly of the family Asilidae",
          "tags": [
            "masculine"
          ],
          "word": "ктырь"
        }
      ]
    }
  ],
  "word": "robber fly"
}

{
  "forms": [
    {
      "form": "robber flies",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "robber flies"
      },
      "expansion": "robber fly (plural robber flies)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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        "en:Asilomorph flies"
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      "glosses": [
        "Any fly of the family Asilidae."
      ],
      "links": [
        [
          "Asilidae",
          "Asilidae#Translingual"
        ]
      ],
      "synonyms": [
        {
          "word": "assassin fly"
        }
      ]
    }
  ],
  "synonyms": [
    {
      "word": "robberfly"
    },
    {
      "word": "robber-fly"
    }
  ],
  "translations": [
    {
      "code": "pl",
      "lang": "Polish",
      "sense": "any fly of the family Asilidae",
      "tags": [
        "masculine"
      ],
      "word": "łowik"
    },
    {
      "code": "ru",
      "lang": "Russian",
      "roman": "ktyrʹ",
      "sense": "any fly of the family Asilidae",
      "tags": [
        "masculine"
      ],
      "word": "ктырь"
    }
  ],
  "word": "robber fly"
}