Historical References
yūmbăk : magic, putting magic into meat, etc. (Ngalbaitch; Bates XII 2B, 7a)
yump : fetish, death magic, sorcery (Douglas 1968: 89)
yuump, yuupp : magic, magic bundle of feathers or hair for sorcery (Von Brandenstein 1988: 144)
yoomp : magic (black) (Whitehurst 1992: 41)
mayakeniny