The Collaborative International Dictionary
Unbay
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.]
I ought . . . to unbay the current of my passion.
--Norris.
Wiktionary
unbay
vb. (context obsolete transitive English) To free from the restraint of anything that surrounds or encloses.