1. a small South American freshwater fish with very sharp teeth that often attacks in groups
2. a person who behaves aggressively or ruthlessly, especially in business
Usage: figurative

Examples

• The river was full of piranhas that could strip flesh from bone in minutes.
• Tourists were warned not to swim in waters where piranhas lived.
• The documentary showed how piranhas hunt in schools.
• He’s a real piranha in the boardroom, always looking for his next victim.
• The business piranhas circled the failing company.
• Piranhas are native to the Amazon basin.