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Yachting Glossary - U

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una rig Boat rigged with a single sail.
under bare poles Having no sails up. In heavy weather the windage of the mast and other spars can still be enough to move the boat.
under the lee On the lee side of an object, protected from the wind.
under way A vessel in motion is under way.
undertow Strong offshore current extending to the shore.
unfurl To unfold or unroll a sail. The opposite of furl.
union jack A small flag representing the nationality of the boat. 
upwind Object nearer the direction the wind is coming from than the observer.
uphaul A line or wire used to control the height of a spinnaker pole