An Etymological Dictionary of the German Language/Annotated/Schrunde
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Schrunde, feminine, ‘cleft, gap, crevice,’ from Middle High German schrunde, feminine, ‘rift, notch, rocky cave’; compare the equivalent Old High German scrunta, scruntunna, Allied to Old High German scrintan, Middle High German schrinden, ‘to burst, fly open, crack.’ Teutonic root skrend, from Pre-Teutonic skrent; compare Lithuanian skrentu (skręsti), ‘to form into a crust.’