Enter a clue or pattern or both:
The Clue
Sound of flapping sails (8 letter answer)
The Answer
SLATTING
Tags
Notes
The answer SLATTING is so rare that it appears less than once every 2500 puzzles.
Definition
SLAT as a verb:
1. equip or bar with slats; "Slat the windows"
2. close the slats of (windows)