The Chinese word 替补 (tìbǔ), meaning "substitute" or "replacement", is a compound word formed by combining two meaningful characters, each contributing a key aspect of the overall concept. The first character, 替 (tì), carries the core idea of "replacing" or "taking the place of". The second character, 补 (bǔ), means "to fill" or "to make up for a deficiency". When combined, the sequence logically implies the action of filling a vacancy by taking someone's place, perfectly encapsulating the idea of a substitute player on a team or a stand-in for any role.