The Collaborative International Dictionary of English v.0.48:

Versify \Ver"si*fy\, v. i. [imp. & p. p. Versified; p. pr. &
   vb. n. Versifying.] [OE. versifien, F. versifier, L.
   versificare; versus a verse + -ficare to make. See Verse,
   and -fy.]
   To make verses.
   [1913 Webster]

         I'll versify in spite, and do my best.   --Dryden.
   [1913 Webster]