unhang

verb

1. (transitive)To take down something (such as a picture) from a hanging position
2. (transitive)Hypothetically, to undo the execution of (a person) by hanging.

   “There is a clear line of distinction in this matter. An equity judge could not unhang a man who had been wrongfully hanged; but he could set aside a precedent which was manifestly contrary to law and justice.”

   “But, having hung him, you cannot unhang him. With all your liability to err, you dare to take a step, which, if wrong at all, is infinitely so, because irretrievable.”