roar

Short definition from Wiktionary

Verb

1. 1
   To make a loud, deep cry, especially from pain, anger, or other strong emotion.
2. 2
   To laugh in a particularly loud manner.
3. 3
   Of animals (especially a lion), to make a loud deep noise.
4. 4
   Generally, of inanimate objects etc., to make a loud resounding noise.
5. 5
   To proceed vigorously.
6. 6
   To cry aloud; to proclaim loudly.
7. 7
   To be boisterous; to be disorderly.
8. 8
   To make a loud noise in breathing, as horses do when they have a certain disease.
9. 9
   To cry.

Noun

1. 1
   A long, loud, deep shout, as of rage or laughter, made with the mouth wide open.
2. 2
   The cry of the lion.
3. 3
   The deep cry of the bull.
4. 4
   A loud resounding noise.
5. 5
   A show of strength or character.