资料来源 : Webster's Revised Unabridged Dictionary (1913)

Luff \Luff\, 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.)
   (a) The side of a ship toward the wind.
   (b) The act of sailing a ship close to the wind.
   (c) The roundest part of a ship's bow.
   (d) 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.