The crowd roared itself hoarse.
The engines roared.
The truck roared down the road.
To roar oneself hoarse.
The audience roared at his jokes.
An example of a roar is the sound of thunder.
An example of roar is to laugh deeply and heartily.
An example of roar is the combined sound of many people talking.
The lioness roared to scare off the hyenas.
The roar of a motorbike.