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thumb|Reefed Sail thumb|Gaff sail, showing reefing cringles (13), reefing points (20) and reefing lines (21)
thumb|Reefed Sail thumb|Gaff sail, showing reefing cringles (13), reefing points (20) and reefing lines (21)
In sailing, reefing is the practice of reducing the area of a sail to preserve a sailing vessel's stability in strong winds. This is usually achieved by folding or rolling one edge of the canvas in on itself and attaching the unused portion to a spar or a . Restoring full sail area is termed shaking out a .
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).