a. 1. Never mounted by a rider; unbroken. “Unbacked colts.” Shak. [ 1913 Webster ]
2. Not supported or encouraged; not countenanced; unaided. Daniel. [ 1913 Webster ]
v. t. [ 1st pref. un- + pack. ] [ 1913 Webster ]
1. To separate and remove, as things packed; to open and remove the contents of; as, to unpack a trunk. [ 1913 Webster ]
2. To relieve of a pack or burden. [ R. ] Shak. [ 1913 Webster ]
n. One who unpacks. [ 1913 Webster ]