The word 变成 is formed by combining two individual characters, each contributing a core meaning to create a new, unified concept. The first character, 变 (biàn), carries the inherent idea of "change" or "transformation". The second character, 成 (chéng), carries the inherent idea of "completion", "success", or "becoming". Their combination fuses these ideas into a single, coherent process: 变 initiates the action of changing, and 成 signifies the culmination of that action into a new state or form, thus together representing the complete idea of "to change into" or "to become".