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Webster 1913 Edition

Noun.

[2d

bunt

line

(Naut.)

One of the ropes toggled to the footrope of a sail, used to haul up to the yard the body of the sail when taking it in.

Totten.

buntline ‎(plural buntlines)

A type of revolver with an exceptionally long barrel.
(nautical) Any, except the outermost, of the ropes extending down to the deck with which a square sail is rolled up to the yard.

rope to roll up a square sail