Where does “hiu tagu” come from?

hiu tagu (Old High German) comes from Proto-Germanic hiu dagu, from Proto-Germanic hinō dagō — today, on this day.

Ancestry of “hiu tagu”, step by step

StepLanguageWordMeaning
1Proto-Germanichiu daguon this day
2Proto-Germanichinō dagōtoday, on this day
Every word from Proto-Germanic hinō dagō →Every word from Proto-Germanic hiu dagu →