• Webster's Revised Unabridged Dictionary
    • n Parbuckle 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.
    • v. t Parbuckle To hoist or lower by means of a parbuckle.
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Century Dictionary and Cyclopedia
    • n parbuckle A device for raising or lowering a heavy body, as a cask, gun, etc., along an inclined plane or vertical surface. A bight of a rope is made round a post or other secure fastening at the level to which the object is to be raised or from which it is to be lowered. The two ends of the rope are then passed under the object and brought over it, and are hauled or slackened together to raise or lower the object as may be required, the object itself acting as a movable pulley. The name is also applied to a sling made with a rope, as shown at a in the cut.
    • parbuckle To hoist or lower by means of a parbuckle.
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Chambers's Twentieth Century Dictionary
    • n Parbuckle pär′buk'l, a purchase made by looping a rope in the middle to aid in rolling casks up or down an incline, or in furling a sail by rolling the yards: a sling made by passing both ends of a rope through its bight
    • v.t Parbuckle to hoist or lower by a parbuckle:—pr.p. par′buckling; pa.p. par′buckled
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In literature:

Parbuckle me, if you ain't the loveliest gal I've ever set eyes on.
"The Complete Plays of Gilbert and Sullivan" by William Schwenk Gilbert and Arthur Sullivan
The parbuckle is frequently used in public-house vaults.
"The Sailor's Word-Book" by William Henry Smyth
The lower mast had already been parbuckled on to the deck, where sheer-legs had been erected by another party.
"A Roving Commission" by G. A. Henty
Parbuckle the shears aboard, with their heads aft.
"The Seaman's Friend" by Richard Henry Dana