An Etymological Dictionary of the German Language/Klapp

by Friedrich Kluge

Klapp, m., ‘clap, slap, blow,’ ModHG. only, adopted from LG., like its cognates (Klappe, klappen, Klapps). Only klappern, vb., ‘to clatter,’ is current in MidHG. without any presumption of its being borrowed; perhaps it is onomatopoetic. ModHG. Klapp, ‘blow,’ is phonetically MidHG. klapf, klaf, m., ‘report, crack’; comp. Klaff.