Reputation damage, also known as 'STAIN' in the crossword, is a term used to describe the negative effects that can occur when an individual or organization's reputation is damaged. This can include loss of trust, credibility, and respect from others, as well as financial losses. Reputation damage can be caused by a variety of factors, such as unethical behavior, poor customer service, or negative publicity. It is important for individuals and organizations to take steps to protect their reputations and prevent damage from occurring.