The Collaborative International Dictionary of English v.0.48:

Unbark \Un*bark"\, v. t. [1st pref. un- + bark rind.]
   To deprive of the bark; to decorticate; to strip; as, to
   unbark a tree. --Bacon.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Unbark \Un*bark"\, v. t. [1st pref. un- + bark the vessel.]
   To cause to disembark; to land. [Obs.] --Hakluyt.
   [1913 Webster]