v. t. [ 1st pref. un- + pin. ] To loose from pins; to remove the pins from; to unfasten; as, to unpin a frock; to unpin a frame. [ 1913 Webster ]
v. t. [ 1st pref. un- + pinion. ] To loose from pinions or manacles; to free from restraint. Goldsmith. [ 1913 Webster ]