归于 (guī yú) is a formal verb meaning 'to belong to' or 'to be attributed to', often used in writing to assign credit, blame, or cause. It is more formal than 属于 (shǔ yú), the everyday word for belonging (e.g., ownership or membership). Unlike 归属 (guī shǔ), which emphasizes organizational affiliation or jurisdiction, 归于 focuses on the result or reason something is ascribed to someone or something.