unimprison means to release from prison; to free. Lexicurio rates it Sui generis — a strength score of 87 out of 100.
Etymology
From un- + imprison.
verb
- To release from prison; to free.“They became activists and advocates, largely unaware of the possibility that, in advocating more of the same services for heretofore underserved populations, they might be exposing unwittingly the cultural parochialism from which they sought to unimprison themselves.”