Толковый словарь английского языка Oxford English Reference - nix

1. n. & v. sl. --n. 1 nothing. 2 a denial or refusal. --v.tr. 1 cancel. 2 reject. Etymology: G, colloq. var. of nichts nothing 2. n. (fem. nixie) a water-elf. Etymology: G (fem. Nixe) 3. int. Brit. sl. giving warning to confederates etc. that a person in authority is approaching. Etymology: 19th c.: perh. = NIX(1)