Leech line is a term used in sailing and refers to the lines that run along the aft edge of a sail. These lines are used to control the shape of the sail and prevent it from fluttering in the wind. However, there are several synonyms that can be used in place of the term "leech line". These include sail ties, leech cords or reefing lines, batten pockets, and sail slides. No matter what term is used, the purpose of these lines remains the same - to ensure that the sail performs optimally and efficiently while out on the water.