An Etymological Dictionary of the German Language/falzen
falzen, vb., ‘to fold, groove, rabbet,’ from MidHG. velzen, valzen, OHG. falzen, ‘to fold’; Falz, m., from MidHG. valz, m., ‘fold, joint’; akin to OHG. anafalz, ‘anvil,’ AS. anfilt, E. anvil, Du. anbeeld, ‘anvil’ (see Amboß). The cognates are undoubtedly connected with falten; MidHG. valz may have been *falti in Goth., which would probably represent falt-ti, pltni- (comp. schnitzen from schneiden). — Falz, see Balz.