"pe de rost" meaning in Roumain

{
  "categories": [
    {
      "kind": "other",
      "name": "Compositions en roumain",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Locutions adverbiales en roumain",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Roumain",
      "orig": "roumain",
      "parents": [],
      "source": "w"
    }
  ],
  "etymology_texts": [
    "Composé de pe, de et rost."
  ],
  "lang": "Roumain",
  "lang_code": "ro",
  "pos": "adv",
  "pos_title": "Locution adverbiale",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Exemples en roumain",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "Am învățat lecţiile mele pe de rost.",
          "translation": "J'ai appris mes leçons par cœur."
        }
      ],
      "glosses": [
        "Par cœur"
      ],
      "id": "fr-pe_de_rost-ro-adv-2MVVwvXs"
    }
  ],
  "word": "pe de rost"
}

{
  "categories": [
    "Compositions en roumain",
    "Locutions adverbiales en roumain",
    "roumain"
  ],
  "etymology_texts": [
    "Composé de pe, de et rost."
  ],
  "lang": "Roumain",
  "lang_code": "ro",
  "pos": "adv",
  "pos_title": "Locution adverbiale",
  "senses": [
    {
      "categories": [
        "Exemples en roumain"
      ],
      "examples": [
        {
          "text": "Am învățat lecţiile mele pe de rost.",
          "translation": "J'ai appris mes leçons par cœur."
        }
      ],
      "glosses": [
        "Par cœur"
      ]
    }
  ],
  "word": "pe de rost"
}