An Etymological Dictionary of the German Language/Annotated/That
That, feminine, ‘deed, act, fact,’ from the equivalent Middle High German and Old High German tât, feminine; a verbal noun formed by gradation from thun. Corresponding to Gothic dêþs, Old Icelandic dáð, Anglo-Saxon dœ̂d, English deed, Dutch daad, Old Saxon dâd. Teutonic dé-di-, from dhê-tí, formed from the Teutonic root dê, dô, from Aryan dhê, dhô. The graded form ê (â) is seen also in the Old High German participle gitân, Middle High German and Modern High German getân. —