U

UNBEND	To cast off or untie. (See BEND.)
UNION	The upper inner corner of an ensign. The rest of the flag is called the fly . The union of the U.S. ensign is a blue field with white stars, and the fly is composed of alternate white and red stripes. Union-down . The situation of a flag when it is hoisted upside down, bringing the union down instead of up. Used as a signal of distress. Union-jack . A small flag, containing only the union, without the fly, usually hoisted at the bowsprit-cap.
UNMOOR	To heave up one anchor so that the vessel may ride at a single anchor. (See MOOR.)
UNSHIP	(See SHIP.)
UVROU.	(See EUVROU.)