腐败 (fǔbài) literally combines 腐 (fǔ), meaning 'rotten' or 'decayed', and 败 (bài), meaning 'to fail' or 'to deteriorate'. Together, they describe a state of moral, institutional, or systemic decay — especially the abuse of power for personal gain. While it can refer to physical rotting (e.g., spoiled food), its dominant modern usage is political or organizational: bribery, embezzlement, nepotism, or abuse of authority by officials or institutions.

The term carries strong negative connotations and appears frequently in official discourse, news media, and anti-corruption campaigns in China. It implies not just individual wrongdoing but systemic weakness and loss of public trust. Unlike neutral terms like 'misconduct', 腐败 suggests deep-rooted, entrenched degradation requiring structural reform — much like organic decay that spreads if left untreated.