1. a person who reveals or makes known something hidden, secret, or discreditable

Examples

• The investigative journalist became an exposer of corporate fraud.
• She was known as an exposer of government corruption.
• The exposer of the scandal faced legal threats from powerful interests.
• He acted as an exposer of the company's unethical practices.
• The documentary featured an exposer who risked his career to tell the truth.
• Environmental exposers have brought attention to illegal dumping in the region.