"en long" meaning in Français

{
  "anagrams": [
    {
      "word": "Longen"
    }
  ],
  "categories": [
    {
      "kind": "other",
      "name": "Locutions adverbiales en français",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Français",
      "orig": "français",
      "parents": [],
      "source": "w"
    }
  ],
  "derived": [
    {
      "word": "avoir les côtes en long"
    }
  ],
  "etymology_texts": [
    "→ voir long"
  ],
  "lang": "Français",
  "lang_code": "fr",
  "pos": "adv",
  "pos_title": "Locution adverbiale",
  "related": [
    {
      "word": "de long en long"
    }
  ],
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Exemples en français",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "Il faut fendre ce bois en long."
        }
      ],
      "glosses": [
        "En longueur, dans le sens de la longueur."
      ],
      "id": "fr-en_long-fr-adv-SR8A1IMS"
    }
  ],
  "word": "en long"
}

{
  "anagrams": [
    {
      "word": "Longen"
    }
  ],
  "categories": [
    "Locutions adverbiales en français",
    "français"
  ],
  "derived": [
    {
      "word": "avoir les côtes en long"
    }
  ],
  "etymology_texts": [
    "→ voir long"
  ],
  "lang": "Français",
  "lang_code": "fr",
  "pos": "adv",
  "pos_title": "Locution adverbiale",
  "related": [
    {
      "word": "de long en long"
    }
  ],
  "senses": [
    {
      "categories": [
        "Exemples en français"
      ],
      "examples": [
        {
          "text": "Il faut fendre ce bois en long."
        }
      ],
      "glosses": [
        "En longueur, dans le sens de la longueur."
      ]
    }
  ],
  "word": "en long"
}