1. a person or thing that roars loudly
2. a horse affected with roaring, a respiratory condition causing loud breathing
Usage: veterinary
3. something very impressive or successful
Usage: informal

Examples

• The lion was a mighty roarer that could be heard across the savanna.
• The crowd became a roarer of approval when the team scored.
• The veterinarian diagnosed the horse as a roarer due to its breathing problems.
• That new movie is a real roarer at the box office.
• The motorcycle’s engine made it a roarer on the highway.
• The comedian’s latest show was such a roarer that tickets sold out immediately.