slang. Also fi’penny, fippen(n)y. [Corruption of FIVE-PENNY.] (See quots.)
1812. J. H. Vaux, Flash Dict., Fi’penny, a clasp-knife.
1889. Barrère & Leland, Slang Dict., Fipenny (thieves), a clasp knife. The term is in common use in Australia, where it was introduced by the convicts.
