Where does “cocktail flu” come from?

cocktail flu (English) comes from English cocktail, from English cock, from Middle English cok, from Old English cōc, from Vulgar Latin cocus, from Latin coquus, from Latin coquō, from English Cook.

cocktail flu (English): A hangover or other negative symptoms experienced the day after ingesting alcohol

Definitions

  1. A hangover or other negative symptoms experienced the day after ingesting alcohol

Ancestry of “cocktail flu”, step by step

cocktail flu traces back through two separate lines of ancestry.

via English cocktail

StepLanguageWordMeaning
1EnglishcocktailA mixed alcoholic beverage; A mixture of other...
2EnglishcockA male bird, "especially:"; A valve or tap for...
3Middle Englishcokrooster, cock; rooster crest, comb; heraldic...
4Old Englishcōca cook
5Vulgar Latincocus
6LatincoquusA cook; person who makes food
7Latincoquōto cook; prepare food
8EnglishCookA placename
9Germankochento cook, to prepare food; to boil; to be stirred...
10Middle High Germankochento cook
11Old High Germankohhōnto cook
12Proto-Germanickukōnąto cook
13Latincoqueresecond-person singular future passive indicative...
14Proto-Italickʷekʷōto cook
15Proto-Indo-Europeanpékʷetito be cooking; to ripen
16Proto-Indo-Europeanpekʷ-to cook; to ripen
17Proto-Indo-Europeanh₃-ép-kʷ-

via English flu

StepLanguageWordMeaning
1EnglishfluInfluenza; Stomach flu
2EnglishinfluenzaAn acute contagious disease of the upper airways...
3Italianinfluenzainfluence; influenza, flu; third-person singular...
4Latinīnfluentiainfluence
5Latinīnfluēnsflowing into
6Latinīnfluōto flow or run into
7Latinīn-un-, non-, not
8Latinînin, at, on, upon, from (space)
9Latinenlookǃ beholdǃ; reallyǃ?; come onǃ
10Proto-Italicenin
11Proto-Indo-Europeanh₁énin
Every word from Proto-Indo-European h₃-ép-kʷ-