"on the quiet" meaning in Anglais

{
  "categories": [
    {
      "kind": "other",
      "name": "Locutions adverbiales en anglais",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Anglais",
      "orig": "anglais",
      "parents": [],
      "source": "w"
    }
  ],
  "lang": "Anglais",
  "lang_code": "en",
  "pos": "adv",
  "pos_title": "Locution adverbiale",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Exemples en anglais",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "Heavy Rain, Sam à Madison Paige",
          "text": "He’s a struck off surgeon that used to sell drugs to junkies on the quiet.",
          "translation": "C’est un chirurgien radié qui vendait des drogues à des camés en douce."
        }
      ],
      "glosses": [
        "En douce."
      ],
      "id": "fr-on_the_quiet-en-adv-DvymRUw4"
    }
  ],
  "sounds": [
    {
      "ipa": "\\ˈɒn ðə ˈkwaɪ.ət\\"
    }
  ],
  "word": "on the quiet"
}

{
  "categories": [
    "Locutions adverbiales en anglais",
    "anglais"
  ],
  "lang": "Anglais",
  "lang_code": "en",
  "pos": "adv",
  "pos_title": "Locution adverbiale",
  "senses": [
    {
      "categories": [
        "Exemples en anglais"
      ],
      "examples": [
        {
          "ref": "Heavy Rain, Sam à Madison Paige",
          "text": "He’s a struck off surgeon that used to sell drugs to junkies on the quiet.",
          "translation": "C’est un chirurgien radié qui vendait des drogues à des camés en douce."
        }
      ],
      "glosses": [
        "En douce."
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "\\ˈɒn ðə ˈkwaɪ.ət\\"
    }
  ],
  "word": "on the quiet"
}