A "loser" refers to someone who has been defeated in a competition or contest. This term is often used in sports, games, or any situation where there is a clear winner and a loser. Being labeled a loser can carry a negative connotation, suggesting failure or lack of success. In a broader context, the term can also describe someone who consistently fails to achieve their goals or is perceived as unsuccessful in life. However, it's important to recognize that everyone experiences defeat at some point, and losing can be a valuable learning experience that contributes to personal growth and resilience.