An Etymological Dictionary of the German Language/schützen
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schützen, vb., ‘to protect, guard, defend, shelter,’ from MidHG. schützen, ‘to embank, dam up, protect,’ which, according to MidHG. beschüten, ‘to protect,’ implies OHG. *skutisôn. The prim. meaning is evident from MidHG. schüte, schüt, f., ‘earth-wall’ which is identical with Schutt.