To bring a vessel's head nearer to the wind, so the sails start to spill wind, by putting the helm down or increasing the sail area toward the stern. Also the order--as in "luff round!" or "luff up!"--to throw the ship's head into the wind in order to tack.
A fluttering action seen on the sails when the wind is pushing on both sides simultaneously. When the boat is headed directly into the wind, the sails will be fully luffing. When sailboat under way is turned slightly toward the source of the wind (or the sail is released until it is an about a 45 degree angle to the wind) a luff will appear at the foremost edge of the sail, while the rest of the sail remains full. The luff looks like a dent in the normally concave surface. The edge of the sail where the luff will first appear is also called the "luff" of the sail.
a) (loffer) To change course toward the wind vent ( contr. To fall off) - b) The leading edge of a sail. Mainsheet (grande écoute) : The device that controls the position and shape of the mainsail. Main sail (grand voile) : the main power source for a sailboat. Mark (marque) : see Buoy. Mastman (équipier de mât): The crewmember who works the lines on the mast when hoisting sails, and who assists the bowman with the work on the foredeck. Mexican takedown : spinnaker douse in which the boat jibes, but the spinnaker is left flying on the new windward side, where it collapses against the jib as it is pulled down. Is believed to have been coined by Buddy Melges during the 1992 campaign.