Glossary
Terms & Glossaries of Shipping and Trading
Luffing
When a sailing vessel is steered far enough to windward that the sail is no longer completely filled with wind (the luff of a fore-and-aft sail begins to flap first).
Loosening a sheet so far past optimal trim that the sail is no longer completely filled with wind.
The flapping of the sail(s) which results from having no wind in the sail at all.
