Source : Webster's Revised Unabridged Dictionary (1913)

Parbuckle \Par"buc`kle\, v. t. [imp. & p. p. {Parbuckled}; p.
   pr. & vb. n. {Parbuckling}.]
   To hoist or lower by means of a parbuckle. --Totten.

Parbuckle \Par"buc`kle\, n.
   (a) A kind of purchase for hoisting or lowering a cylindrical
       burden, as a cask. The middle of a long rope is made fast
       aloft, and both parts are looped around the object, which
       rests in the loops, and rolls in them as the ends are
       hauled up or payed out.
   (b) A double sling made of a single rope, for slinging a
       cask, gun, etc.