What does it mean to "impeach" a person's character?

To impeach a person's character means to call into question their good character. This process typically involves presenting evidence or arguments that suggest the individual has acted inappropriately or unethically in the past, which may undermine their reliability or trustworthiness. In legal contexts, this often relates to challenging a witness's credibility by highlighting past behavior, moral failing, or inconsistencies in their testimony. The goal is to influence how others perceive the individual, particularly in relation to their statements or actions in a given situation. This understanding is crucial in various fields, particularly in law enforcement and legal proceedings, where the integrity of character can significantly impact outcomes.