Definition of roar verb from the Oxford Advanced Learner's Dictionary. [intransitive] to make a very loud, deep sound. We heard a lion roar. The gun roared deafeningly. The engine roared to life (= started noisily). The wind was roaring in my ears. The man roared in pain and fury as he tried to get to his feet. More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.