Definitions
1.nounThe vertical edge of a sail that is closest to the direction of the wind."By easing the halyard, the luff of the sail was made to sag to leeward."
2.nounThe act of sailing a ship close to the wind.
3.nounThe roundest part of a ship's bow.
4.nounThe forward or weather leech of a sail, especially of the jib, spanker, and other fore-and-aft sails.
5.verb(of a sail) To shake due to being trimmed improperly.
6.verb(of a boat) To alter course to windward so that the sails luff. (Alternatively luff up)
7.verbTo let out (a sail) so that it luffs.
8.verbTo alter the vertical angle of the jib of a crane so as to bring it level with the load.