The word **归于** is a compound verb formed by combining the character **归** (guī), which means "to return," "to go back to," or "to belong to," with the character **于** (yú), a classical Chinese preposition often meaning "to," "in," or "at." Together, **归于** functions as a single lexical unit meaning "to attribute to," "to be ascribed to," or "to culminate in/return to (a state)." This formation follows a common pattern in Classical Chinese where a verb (**归**) is coupled with a preposition (**于**) to create a more abstract or formal verb phrase indicating direction, result, or attribution, which has since fossilized into a modern standard word used in both written and formal spoken contexts.