Definitions from Wiktionary (Luff)

▸ noun:  (nautical) The vertical edge of a sail that is closest to the direction of the wind.
▸ noun:  (nautical) The act of sailing a ship close to the wind.
▸ noun:  (nautical) The roundest part of a ship's bow.
▸ noun:  (nautical) The forward or weather leech of a sail, especially of the jib, spanker, and other fore-and-aft sails.
▸ verb:  (nautical, of a sail, intransitive) To shake due to being trimmed improperly.
▸ verb:  (nautical, of sailing vessels, intransitive) To bring the ship's head up closer to the wind. (Alternatively luff up)
▸ verb:  (nautical, transitive) to let out (a sail) so that it luffs.
▸ verb:  (mechanical) To alter the vertical angle of the jib of a crane so as to bring it level with the load.
▸ noun:  A surname.

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