The compound word **过头** is formed through the combination of the verb **过** (guò), meaning "to pass" or "to cross," and the noun **头** (tóu), meaning "head" or "end." Together, they create a metaphorical meaning where "passing the head" signifies exceeding a normal limit or boundary. Structurally, **头** often functions as a suffix indicating an extreme point or degree, making **过头** an adjective or adverb meaning "excessive" or "over the top," and it is also commonly used as a verb complement (as in **做过头**, "to overdo"). This formation exemplifies a common pattern in Chinese where a concrete action (**过**) is combined with a body-part noun (**头**) to express an abstract concept of excess.