A high-level disagreement is a dispute between two or more parties that involves a significant amount of tension and hostility. The term can be used to describe disagreements between individuals, groups, or organizations. In this case, the crossword solution for the term 'high-level disagreement' is 'yelling'. Yelling is a form of verbal communication that is often used to express anger, frustration, or other strong emotions. It is a common response to a high-level disagreement and can be used to emphasize a point or to make a statement.