The word 成长 is formed by combining two characters, each contributing a layer of meaning to create a unified concept. The first character, 成 (chéng), carries the sense of "to complete", "to become", or "to achieve". The second, 长 (zhǎng), means "to grow" or "to increase". Together, they metaphorically depict the process of growth not just as physical increase, but as a journey toward completion and maturity, visualizing a person or thing progressively developing and fulfilling its potential.