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.
(..) truly terrible inside It's a beast He's got fangs, razor sharp ones Massive paws, killer claws for the feast Hear him roar, see him foam But we're not coming home 'Til he's dead Good and dead ALL: Kill the beast! Light your torch, (..)2017 Beauty and the Beast
(..) My room? - But I thought... - LUMIÈRE: Oh, what? That "Once this door closes it will not open again"? (IMITATES ROAR) I know. He gets so dramatic. - Hello. - (GASPS) (GRUNTS) - Ooh! (..)2017 Beauty and the Beast