\Un*bolt"\, v. t. [1st pref. un- + bolt.]
To remove a bolt from; to unfasten; to unbar; to open. ``He
shall unbolt the gates.'' --Shak.

\Un*bolt"\, v. i.
To explain or unfold a matter; to make a revelation. [Obs.]
``I will unbolt to you.'' --Shak.