Halyards are used on a sailing vessel to haul up sails. One end is connected to the top of the sail (the head) and it is led up to the top of the mast, through a block (pulley) and back down. Pulling down on the halyard pulls the sail up. With larger sails a winch is used to assist. When the sail is up all the way, the halyard is 'made fast' or 'cleated.'
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