Luff Meaning in Sailing

Luff refers to the leading edge of a sail (the edge closest to the wind) or the act of a sail flapping when it is not catching the wind properly. If a sailor steers the boat too close to the wind, the luff of the sail will begin to shiver or fold. One specific example involves a sailor ‘luffing up’ to slow the boat down before reaching a dock, essentially using the sails as a brake. Understanding the luff is critical for sail trim; sailors watch the ‘tell-tales’ on the luff to ensure the sail is at the perfect angle. It is the most sensitive part of the sail for gauging wind direction.