The word **一再** is formed through a process of **semantic compounding**, where two distinct characters with related meanings are combined to create a new, reinforced concept. Both **一** (*yī*, often meaning "one" or "once") and **再** (*zài*, meaning "again" or "a second time") independently carry notions of occurrence or repetition. When joined, they do not signify "one and then again" literally but instead function as an **adverbial idiom** that intensifies the idea of repeated action, translating to "repeatedly," "time and again," or "over and over." This formation leverages the rhetorical device of **reduplication for emphasis**, where the two characters synergistically stress the persistence and frequency of an action beyond what a single character could convey.