Post which cannot be forwarded by the postal services because it is illegibly or incorrectly addressed. Freq.
1890 Cent. Dict., Nixy2.
1901 Congress. Rec. 17 Jan. 1145/6 These poor ‘nixie’ clerks in the postoffices of this country.
1905 N.Y. Evening Post 8 Feb. 5 What the railway postal clerks most dread is the class of mail they know as
‘nixies’.
1929 Lit. Digest 5 Oct. 67/1 The similarity in appearance of the letters N.Y. and N.J... is responsible for
many letters reaching the ‘Nixie’ division.
1956 Daily Progress (Charlottesville, Va.) 19 Sept. 28/1 ‘Nixie’
is mail that can't be delivered because the address is incorrect, illegible, or insufficient.
1994 New
Yorker 24 Oct. 68/3 In
the Central Post Office's nixie unit—where mail arrives that has been illegibly or incorrectly addressed—I see street numbers in the seventy thousands.