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From The Collaborative International Dictionary of English v.0.48:
Unbay \Un*bay"\, v. t. [1st pref. un- + bay to dam.] To free from the restraint of anything that surrounds or incloses; to let loose; to open. [Obs.] [1913 Webster] I ought . . . to unbay the current of my passion. --Norris. [1913 Webster]