"dos vert" meaning in Français

{
  "anagrams": [
    {
      "word": "De Vorst"
    },
    {
      "word": "tverdos"
    },
    {
      "word": "verdots"
    }
  ],
  "categories": [
    {
      "kind": "other",
      "name": "Locutions nominales en français",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Poissons en français",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Français",
      "orig": "français",
      "parents": [],
      "source": "w"
    }
  ],
  "etymology_texts": [
    "De dos et vert"
  ],
  "forms": [
    {
      "form": "dos verts",
      "tags": [
        "plural"
      ]
    }
  ],
  "lang": "Français",
  "lang_code": "fr",
  "pos": "noun",
  "pos_title": "Locution nominale",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Exemples en français",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "BernardBreton, Régis Gérard, Tajana Gérard, Tous les poissons d’eau douce - leur pêche et leur gestion, 1999",
          "text": "Le dos est vert-brunâtre (d’où son nom de \"dos vert\"), les flancs argentés marqués d'une bande bleu acier."
        }
      ],
      "glosses": [
        "Synonyme d’able (poisson)."
      ],
      "id": "fr-dos_vert-fr-noun-2ee6cN-6",
      "topics": [
        "zoology"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "\\do vɛʁ\\"
    }
  ],
  "tags": [
    "masculine"
  ],
  "word": "dos vert"
}

{
  "anagrams": [
    {
      "word": "De Vorst"
    },
    {
      "word": "tverdos"
    },
    {
      "word": "verdots"
    }
  ],
  "categories": [
    "Locutions nominales en français",
    "Poissons en français",
    "français"
  ],
  "etymology_texts": [
    "De dos et vert"
  ],
  "forms": [
    {
      "form": "dos verts",
      "tags": [
        "plural"
      ]
    }
  ],
  "lang": "Français",
  "lang_code": "fr",
  "pos": "noun",
  "pos_title": "Locution nominale",
  "senses": [
    {
      "categories": [
        "Exemples en français"
      ],
      "examples": [
        {
          "ref": "BernardBreton, Régis Gérard, Tajana Gérard, Tous les poissons d’eau douce - leur pêche et leur gestion, 1999",
          "text": "Le dos est vert-brunâtre (d’où son nom de \"dos vert\"), les flancs argentés marqués d'une bande bleu acier."
        }
      ],
      "glosses": [
        "Synonyme d’able (poisson)."
      ],
      "topics": [
        "zoology"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "\\do vɛʁ\\"
    }
  ],
  "tags": [
    "masculine"
  ],
  "word": "dos vert"
}