When combined, 守信用 (shǒu xìn yòng) means to actively “guard your trustworthiness.” You are protecting your reputation for being reliable, which is seen as a precious asset in Chinese culture.
In Chinese culture, 守信用 is more than just a positive personality trait; it's a cornerstone of social harmony and the foundation of all meaningful relationships, a concept known as 关系 (guānxi). Rooted in Confucian values of integrity (诚, chéng) and righteousness (义, yì), being a person who keeps their word is a fundamental moral obligation. A useful comparison is to the Western concept of “a legally binding contract.” In the West, a signed contract is often seen as the ultimate symbol of a commitment. While contracts are certainly used in China, a person's or company's long-standing reputation for 守信用 can often be seen as even more important. It's the social and moral collateral that makes business possible in the first place. Breaking a promise doesn't just risk a lawsuit; it risks destroying your social credit, losing face (面子, miànzi), and being ostracized from valuable social and business networks. This social enforcement makes the concept incredibly powerful.
守信用 is a relatively formal term used to describe a core value in people and organizations.