1. to publicly declare that someone or something is wrong or evil
2. to give information against someone to the authorities; to inform on

Examples

• The senator denounced the corruption in city government.
• Human rights groups denounced the new law as discriminatory.
• She denounced her former business partner for fraud.
• The newspaper editorial denounced the company’s environmental practices.
• He was afraid his neighbor would denounce him to the police.
• The activist denounced the government’s treatment of refugees.