Full

Flood

The incoming phase of the tide, when water level is rising and the flow runs landward.

Furl

To roll or gather up a sail so it stows neatly on a boom, stay, or inside a spar.

Furling line

The continuous control line led back to the cockpit that drives a headsail, code zero, or …

Fore

Forward, or toward the bow.

Foresail

A collective term for a jib or genoa — any sail set forward of the mast.

Fend off

To push the vessel clear of an obstacle by hand, foot, or boat hook.