Sailing Terms - other interesting items

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Trim: To pull in... as in trim a sheet. (line)
Ease: To let out... as in ease a sheet. (line)
Overtrim: A condition where the sail is trimmed in too tightly for the wind direction.
Undertrim: A condition where the sail is trimmed too loosely for the wind direction.  The Sail will luff if undertrimmed more than a slight amount.
Beat: Sailing to windward by means of a Series of tacks.
Reefing: Reducing the area of a sail due to strong wind.
True Wind: The wind speed and direction as seen by a stationary observer.
Apparent Wind: The wind speed and direction as seen by an observer who is moving across the water.
Weather Helm: The tendency of a sailboat to head into the wind if the helm is released. (letting go of the tiller)
Lee Helm: The tendency of a sailboat to head away from the wind if the helm is released.
Header: Change in wind direction towards the bow of the boat.
Lift: Change in wind direction towards the stern of the boat. A header for a boat on port tack is a lift for a boat on starboard tack.
Beam: The widest section of a boat, generally across the middle.
Abeam: The direction to either side of the boat. (90 degrees from the bow)
Underway: When the boat is neither at anchor, made fast or aground.
No Way: When the boat is stopped.