If someone gets a sentence of 60 days in jail "not stayed", do they go to prison right then?
A sentence of 60 days in prison was given along with 1 year of probation starting the day of the trial. There was significant personal injury to others in this case and the judge specifically said the sentence is "not stayed". Does that mean he went to prison right then or does it mean that he has a chance to stay out due to probation?
"Not stayed" means the sentence is to be served starting right then and there. A "stay," in legalese, is a delay of any sort, usually in connection with a sentence or other order; another use of this is in bankruptcy law, where the filing of the bankruptcy petition puts an automatic stay on lawsuits against the debtor.
In criminal or DUI cases, the sentence is stayed, sometimes, either to allow the defendant a few days to arrange his affairs or pending an appeal, if one is expected (for example, if there was a question raised at trial about whether the breath test was done properly). The defendant in this case probably did get sent directly to jail. If he appeals, he would be able to ask the appellate court for a stay, but that would probably depend on whether his appeal looked like it had any chance of success.