The word "正好" is formed through the conceptual merging of its two component characters: "正", which carries the core idea of being upright, exact, or directly in the center (implying precision and correctness), and "好", which fundamentally means good, proper, or satisfactory. Their combination does not merely add meanings but fuses them to create a new, unified concept, the state where exact timing, alignment, or amount coincides perfectly with what is needed or desired, thus yielding an outcome that is "just right" or "exactly good". It embodies a satisfying convergence of precision and favorable appropriateness.