Off the wind

Outhaul

The control line attached to the clew of the mainsail, tensioning the foot along the boom.

Overpowered

Heeling excessively because the boat is carrying too much sail for the wind strength.

Offshore

Away from land, or out of sight of it.

Outboard

Outside the rail, or toward or beyond the sides of the boat.

Offshore wind

A wind blowing from the shore out toward open water.

On the wind

Close-hauled — sailing as near the wind as the boat will efficiently go.