If there is uproar, there is a lot of shouting and noise because people are very angry or upset about something. The announcement caused uproar in the crowd The courtroom was in an uproar
You can also use uproar to refer to a lot of public criticism and debate about something that has made people angry. The town is in uproar over the dispute The surprise announcement could cause an uproar in the United States. a lot of noise or angry protest about something be in (an) uproar (oproer, from op + roer ; influenced by roar)