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.
(..) ( screaming ) ( all shouting ) ( grunts ) Aah! ( grunts ) ( roars ) Yah! ( grunting ) Aah! ( groans ) ( shouting ) (..)2017 TvShow: Game of Thrones Title: Stormborn Season: 7 Episode 2