making or uttering a roar

he was greeted everywhere with roaring crowds

a swollen, roaring river

very obviously or unequivocally the thing mentioned (used for emphasis)

last week's 70s night was a roaring success

two roaring drunk firemen

(of a lion or other large wild animal) utter a full, deep, prolonged cry

we heard a lion roar

(especially of a vehicle) move at high speed making a loud prolonged sound

a car roared past