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pipes. Ornamental organ pipes that make no sound. An obsolete slow dance in 4-4 dump. Bamipe 2.(doompf),f), dumpfig ump dumpfig (doomp’ (doomp’- fikh), G. Dull, muffled. Dumpfigkeit (kit). Dulne . duo (doo’ 5), I. Two; in two parts; a duet, especially of 2 voices or instrs. of the same kind. d. concertante. A duo in which each part is alternately principal.