v. t. [ 1st pref. un- + tack. ] To separate, as what is tacked; to disjoin; to release. [ 1913 Webster ]
being untacked from honest cares. Barrow. [ 1913 Webster ]
v. t. [ 1st pref. un- + tackle. ] To unbitch; to unharness. [ Colloq. ] Tusser. [ 1913 Webster ]
v. t. [ 1st pref. un- + pack. ] [ 1913 Webster ]
n. One who unpacks. [ 1913 Webster ]