"en aval du" meaning in Français

{
  "categories": [
    {
      "kind": "other",
      "name": "Locutions prépositives en français",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Français",
      "orig": "français",
      "parents": [],
      "source": "w"
    }
  ],
  "lang": "Français",
  "lang_code": "fr",
  "pos": "prep",
  "pos_title": "Locution prépositive",
  "senses": [
    {
      "glosses": [
        "Contraction de en aval de et de l’article le."
      ],
      "id": "fr-en_aval_du-fr-prep-21q9SYWz"
    }
  ],
  "sounds": [
    {
      "ipa": "\\ɑ̃.n‿a.val dy\\"
    }
  ],
  "word": "en aval du"
}

{
  "categories": [
    "Locutions prépositives en français",
    "français"
  ],
  "lang": "Français",
  "lang_code": "fr",
  "pos": "prep",
  "pos_title": "Locution prépositive",
  "senses": [
    {
      "glosses": [
        "Contraction de en aval de et de l’article le."
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "\\ɑ̃.n‿a.val dy\\"
    }
  ],
  "word": "en aval du"
}