Where does “sweet whiskey” come from?

sweet whiskey (English) comes from English whiskey, from English ey, from English they, from English the'e, from English there, from Old English þær, from Proto-West Germanic þār, from Proto-Germanic þar — this; that.

Ancestry of “sweet whiskey”, step by step

sweet whiskey traces back through two separate lines of ancestry.

via English whiskey

StepLanguageWordMeaning
1EnglishwhiskeyA liquor distilled from the fermented mash of...
2EnglisheyAn egg; An island; 1975 August 23, Black, Judie,...
3EnglishtheyA group of people, animals, plants, or objects...
4Englishthe'ePronunciation spelling of there
5EnglishthereIn a place or location at some distance from the...
6Old Englishþærthere
7Proto-West Germanicþārthere
8Proto-Germanicþarthere, in that place
9Proto-Indo-Europeantar-there
10Proto-Indo-Europeanto-it; that; the, that
11Proto-Indo-Europeanthis; that

via English sweet

StepLanguageWordMeaning
1EnglishsweetHaving a pleasant taste, especially one relating...
2Middle Englishswetesweet, pleasant-tasting; sweet in smell;...
3Old Englishswētesweet
4Proto-West Germanicswōtīsweet
5Proto-Germanicswōtuzsweet
6Proto-Indo-Europeanswéh₂dussweet
7Proto-Indo-Europeansweh₂d-sweet
Every word from Proto-Indo-European Every word from Proto-Indo-European to-Every word from Proto-Indo-European tar-
sweet whiskey — Etymology, Origin & Word History | Etymology Explorer