Bowline = A rope fastened near the middle of the leech or perpendicular edge of the square sails, by subordinate ropes called bridles, and used to keep the weather edge of the sail tight forward when the ship is close-hauled.

…
“Twenty years from now you will be more disappointed by the things that you didn’t do than by the ones you did do. So throw off the bowlines. Sail away from the safe harbor. Catch the trade winds in your sails. Explore. Dream. Discover.”
– Mark Twain

Art by Carl Brandt.