An Etymological Dictionary of the German Language/Annotated/flisch
flisch, adjective,‘fresh, cool, raw (of a wound),’ from Middle High German vrisc, Old High German frisc, adjective, ‘new, young, cheerful, active, pert’; corresponding to Anglo-Saxon fërsc, English fresh, Old Icelandic ferskr, ‘fresh.’ The further origin is obscure; on account of its meaning Latin priscus (akin to prior, prius) cannot be allied; perhaps Old High German frisc is derived from früh, Old High German fruo. The High German word found its way at an early period into Romance (comp, Italian fresco, French frais), and into English (frisk).