"Dirty" refers to something that is not clean or is soiled. This can apply to various contexts, such as physical objects, environments, or even personal hygiene. For example, a dirty room may have dust, trash, or stains, making it unpleasant and unhealthy. In a broader sense, "dirty" can also describe actions or behaviors that are unethical or morally questionable. For instance, a dirty trick in sports might involve cheating to gain an unfair advantage. Overall, the term highlights a lack of cleanliness or integrity in different aspects of life.