The Collaborative International Dictionary of English v.0.48:

Spire \Spire\, v. i. [imp. & p. p. Spired; p. pr. & vb. n.
   Spiring.]
   To shoot forth, or up in, or as if in, a spire. --Emerson.
   [1913 Webster]

         It is not so apt to spire up as the other sorts, being
         more inclined to branch into arms.       --Mortimer.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Spiring \Spir"ing\, a.
   Shooting up in a spire or spires. "The spiring grass."
   --Dryton.
   [1913 Webster]