1. a small South American freshwater fish with very sharp teeth that often attacks in groups
2. a person who is ruthless or aggressive, especially in business or competition
Usage: informal

Examples

• The piranha is native to the Amazon River basin.
• Piranhas are known for their powerful jaws and razor-sharp teeth.
• The documentary showed a school of piranhas feeding on a fish.
• Swimming in piranha-infested waters can be dangerous.
• The corporate lawyer was a real piranha in the courtroom.
• She described her competitors as piranhas circling for business.