"cocktail flu" meaning in Anglais

{
  "categories": [
    {
      "kind": "other",
      "name": "Locutions nominales en anglais",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Anglais",
      "orig": "anglais",
      "parents": [],
      "source": "w"
    }
  ],
  "etymology_texts": [
    "(Date à préciser) Composé de cocktail (« cocktail (la boisson) ») et de flu (« grippe »), littéralement « grippe du cocktail »."
  ],
  "lang": "Anglais",
  "lang_code": "en",
  "pos": "noun",
  "pos_title": "Locution nominale",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Noms indénombrables en anglais",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Termes informels en anglais",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "Elissa Schappell, A Glass Half Empty, Modern Love sur The New York Times, 17 août 2017",
          "text": "There were, of course, the hangovers. Mornings we’d wake up late, stumble to Veselka or Café Orlin in the East Village for something greasy and restorative, then trundle home to collapse on the sofa, felled by the cocktail flu, giving us permission to watch basketball doubleheaders and doze all day in each other’s arms, getting up only to be ill."
        }
      ],
      "glosses": [
        "Gueule de bois (effets désagréables, tels la nausée ou la céphalée, provoquée par une consommation excessive d’alcool)."
      ],
      "id": "fr-cocktail_flu-en-noun-KszOw8Ny",
      "tags": [
        "informal",
        "uncountable"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "hangover"
    }
  ],
  "word": "cocktail flu"
}

{
  "categories": [
    "Locutions nominales en anglais",
    "anglais"
  ],
  "etymology_texts": [
    "(Date à préciser) Composé de cocktail (« cocktail (la boisson) ») et de flu (« grippe »), littéralement « grippe du cocktail »."
  ],
  "lang": "Anglais",
  "lang_code": "en",
  "pos": "noun",
  "pos_title": "Locution nominale",
  "senses": [
    {
      "categories": [
        "Noms indénombrables en anglais",
        "Termes informels en anglais"
      ],
      "examples": [
        {
          "ref": "Elissa Schappell, A Glass Half Empty, Modern Love sur The New York Times, 17 août 2017",
          "text": "There were, of course, the hangovers. Mornings we’d wake up late, stumble to Veselka or Café Orlin in the East Village for something greasy and restorative, then trundle home to collapse on the sofa, felled by the cocktail flu, giving us permission to watch basketball doubleheaders and doze all day in each other’s arms, getting up only to be ill."
        }
      ],
      "glosses": [
        "Gueule de bois (effets désagréables, tels la nausée ou la céphalée, provoquée par une consommation excessive d’alcool)."
      ],
      "tags": [
        "informal",
        "uncountable"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "hangover"
    }
  ],
  "word": "cocktail flu"
}