資料來源 : Webster's Revised Unabridged Dictionary (1913)

Butt shaft \Butt" shaft`\
   An arrow without a barb, for shooting at butts; an arrow.
   [Also {but shaft}.] --Shak.

資料來源 : WordNet®

butt shaft
     n : an blunt arrow without a barb; an arrow used for target
         practice