1. to make a mistake or be incorrect
Usage: formal
2. to do wrong morally or ethically
Usage: formal; literary

Examples

• To err is human, to forgive divine.
• The judge warned the jury not to err in their decision.
• I would rather err on the side of caution.
• The accountant erred in his calculations.
• We all err from time to time.
• The witness erred when she gave false testimony.