In sailing, luffing refers to when a sailing vessel is steered far enough toward the direction of the wind (`windward`), or the sheet controlling a sail is eased so far past optimal trim, that airflow over the surfaces of the sail is disrupted and the sail begins to `flap` or `luff` (the luff of the sail is usually where this first becomes e...
• (p. pr. & vb. n.) of Luff
The flapping which occurs when the leading edge of sail stalls.
Pointing the yacht into the wind - sail flapping.