The forward edge of a sail in sailing, also called the luff.
From 'fore-' (front) + 'leech' (the edge of a sail). The term originates from nautical terminology where 'leech' refers to the vertical edge of canvas, with 'foreleech' being the leading edge.
The foreleech of a sail is where aerodynamic magic happens—sailors feel the air flow and adjust their angle constantly, which is why competitive sailors obsess over every tiny wrinkle there.
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