Noise made by big cats and Katy Perry

verb

1. To utter or emit a full loud prolonged sound
2. To sing or shout with full force
3. To make or emit a loud confused sound (such as background reverberation or rumbling)
4. To laugh loudly
5. To be boisterous or disorderly
6. To proceed or rush with great noise or commotion
7. To make a loud noise during inhalation (such as that of a horse affected with roaring)
8. To utter or proclaim with a roar
9. To cause to roar

noun

1. The deep cry of a wild animal (such as a lion)
2. A loud deep cry (as of pain or anger)
3. A loud continuous confused sound

   "the roar of the crowd"

4. A boisterous outcry

idiom

1. To make a loud sound and begin functioning well

   "The engine suddenly roared to life."

idiom

1. To begin working

   "The engine suddenly roared to life."