守信 (shǒu xìn) literally means 'to guard/keep trust' — 守 (shǒu) means 'to guard, uphold, or abide by', and 信 (xìn) means 'trust, faith, or promise'. Together, they form a compound verb meaning 'to keep one's word' or 'to be trustworthy'. It emphasizes reliability in fulfilling commitments, especially verbal promises or agreements. This term carries strong moral weight in Chinese culture, where integrity and credibility are highly valued in personal relationships, business, and social conduct.

守信 is commonly used in formal and semi-formal contexts — for example, describing someone’s character ('他很守信'), evaluating behavior ('守信是做人的基本准则'), or giving advice ('答应别人的事一定要守信'). It is rarely used as a standalone command but often appears in subject-predicate structures or as a descriptive adjective-like verb after subjects like 人, 孩子, or 公司. Unlike colloquial phrases like 说话算数, 守信 sounds more principled and enduring.