Fish, To—To strengthen a weak or repair a broken spar by lashing another spar or batten to it.
Flare—To project outwards; contrary to tumbling home.
Flat aft—When sheets are trimmed as close as possible for effective windward work.
Floors—The bottom timbers of a vessel.
Flowing sheet—The sheet eased off to a fair wind.
Flush decked—Having neither poop nor forecastle.
Foot—The lower edge of a sail.
Forereach—To sail faster through the water on a wind than another vessel.
Freeboard—That part of a ship's side above the water.
Full and by—To steer as close to the wind as possible, while at the same time keeping the sails full of wind.