The engine suddenly 'roared (back) to life'. [=it made the loud sound of an engine and began running well]
The audience 'roared' with laughter. [=the audience laughed loudly for a long time]
The fans were 'roaring' [=yelling and cheering loudly] after their team scored.
(..) ...and his target is far away. The old ones say we Spartans are descended from Hercules himself. Bold Leonidas gives testament to our bloodline. His roar is long and loud. My king. It's an honor to die at your side. It's an honor to have lived at yours. My queen! My wife. (..)2006 300