The word 头晕 (tóu yūn) is a compound formed by combining two characters: 头 (tóu), meaning "head", and 晕 (yūn), meaning "dizzy" or "faint". It follows a subject-predicate grammatical structure common in Chinese, where 头 is the subject (what is affected) and 晕 describes its state (feeling dizzy). Together, they create a vivid, literal image of "head-dizziness" to express the physical sensation of vertigo or lightheadedness, demonstrating how Chinese often constructs terms through direct, logical combinations of meaningful components.