Leech

The trailing edge of a sail.

How to sign

Use Dominant 1-hand, fingers together: edge line. The base or passive hand is Non-dominant flat-B: sail plane. Set the sail plane. Put the index at the head/top corner. Trace downward along the aft edge opposite the luff, ending at the clew. Hold at the low aft clew endpoint. Establish a sail triangle. With a 1-hand, trace its aft edge from head down to clew. Keep the line opposite the luff.