The Collaborative International Dictionary
Luff upon luff
Luff \Luff\ (l[u^]f), n. [OE. lof, prob. a sort of timber by which the course of a ship was directed, perh. a sort of paddle; cf. D. loef luff, loeven to luff. The word is perh. akin to E. glove. Cf. Aloof.] (Naut.)
The side of a ship toward the wind.
The act of sailing a ship close to the wind.
The roundest part of a ship's bow.
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The forward or weather leech of a sail, especially of the jib, spanker, and other fore-and-aft sails.
Luff tackle, a purchase composed of a double and single block and fall, used for various purposes.
--Totten.Luff upon luff, a luff tackle attached to the fall of another luff tackle.
--R. H. Dana, Jr.