A rope on a sailing ship attached to the foot of a square sail, used to pull the sail up to the yard for furling or reefing.
Nautical term from 'bunt' (the middle sagging part of a sail when lowered) plus 'line' (rope), used in sailing since at least the 1600s.
Sailors' language is so specific that 'buntline' describes exactly where the rope is, what it does, and which part of the sail it touches—nothing wasted, everything practical.
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