Meaning of “roar” - Learner’s Dictionary

roar

verb uk us /rɔːr/
MAKE NOISE [ I ]

to make a loud, deep sound:

We could hear a lion roaring from the other side of the zoo.
She roared with laughter.
roar past/down, etc

If a vehicle roars somewhere, it moves fast making a loud noise:

A huge motorcycle roared past.
SHOUT [ I, T ]

to say something in a very loud voice:

"Stop that!" he roared.

(Definition of “roar verb” from the Cambridge Learner’s Dictionary © Cambridge University Press)