An Etymological Dictionary of the German Language/Rumpf
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Rumpf, m., ‘trunk, body,’ from the equiv. MidHG. (MidG.) rumph, m.; in UpG. and MidG. botech, OHG. botah (AS. bodig, E. body). Comp. LG. rump, Du. romp, ‘trunk,’ MidE. rumpe, E. rump, Scand. rumpr, ‘rump.’ Allied to rümpfen?.